diff --git a/wp-admin/includes/plugin.php b/wp-admin/includes/plugin.php
index 792b2a63d8..2dd58b3354 100644
--- a/wp-admin/includes/plugin.php
+++ b/wp-admin/includes/plugin.php
@@ -430,13 +430,17 @@ function _get_dropins() {
 }
 
 /**
- * Check whether a plugin is active.
+ * Determines whether a plugin is active.
  *
  * Only plugins installed in the plugins/ folder can be active.
  *
  * Plugins in the mu-plugins/ folder can't be "activated," so this function will
  * return false for those plugins.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.5.0
  *
  * @param string $plugin Path to the main plugin file from plugins directory.
@@ -447,10 +451,14 @@ function is_plugin_active( $plugin ) {
 }
 
 /**
- * Check whether the plugin is inactive.
+ * Determines whether the plugin is inactive.
  *
  * Reverse of is_plugin_active(). Used as a callback.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 3.1.0
  * @see is_plugin_active()
  *
@@ -462,17 +470,21 @@ function is_plugin_inactive( $plugin ) {
 }
 
 /**
- * Check whether the plugin is active for the entire network.
+ * Determines whether the plugin is active for the entire network.
  *
  * Only plugins installed in the plugins/ folder can be active.
  *
  * Plugins in the mu-plugins/ folder can't be "activated," so this function will
  * return false for those plugins.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 3.0.0
  *
  * @param string $plugin Path to the main plugin file from plugins directory.
- * @return bool True, if active for the network, otherwise false.
+ * @return bool True if active for the network, otherwise false.
  */
 function is_plugin_active_for_network( $plugin ) {
 	if ( !is_multisite() )
diff --git a/wp-includes/admin-bar.php b/wp-includes/admin-bar.php
index 1be7034a40..d2156e4cca 100644
--- a/wp-includes/admin-bar.php
+++ b/wp-includes/admin-bar.php
@@ -985,8 +985,12 @@ function show_admin_bar( $show ) {
 }
 
 /**
- * Determine whether the admin bar should be showing.
- *
+ * Determines whether the admin bar should be showing.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 3.1.0
  *
  * @global bool   $show_admin_bar
diff --git a/wp-includes/author-template.php b/wp-includes/author-template.php
index 4baf681479..f3efee133e 100644
--- a/wp-includes/author-template.php
+++ b/wp-includes/author-template.php
@@ -503,10 +503,14 @@ function wp_list_authors( $args = '' ) {
 }
 
 /**
- * Does this site have more than one author
+ * Determines whether this site has more than one author.
  *
  * Checks to see if more than one author has published posts.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 3.2.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.
diff --git a/wp-includes/category-template.php b/wp-includes/category-template.php
index e090fac264..83cb24c7e1 100644
--- a/wp-includes/category-template.php
+++ b/wp-includes/category-template.php
@@ -212,7 +212,7 @@ function get_the_category_list( $separator = '', $parents = '', $post_id = false
 }
 
 /**
- * Check if the current post is within any of the given categories.
+ * Checks if the current post is within any of the given categories.
  *
  * The given categories are checked against the post's categories' term_ids, names and slugs.
  * Categories given as integers will only be checked against the post's categories' term_ids.
@@ -222,6 +222,10 @@ function get_the_category_list( $separator = '', $parents = '', $post_id = false
  * Prior to v2.7, only one category could be compared: in_category( $single_category ).
  * Prior to v2.7, this function could only be used in the WordPress Loop.
  * As of 2.7, the function can be used anywhere if it is provided a post ID or post object.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 1.2.0
  *
@@ -1367,7 +1371,7 @@ function has_category( $category = '', $post = null ) {
 }
 
 /**
- * Check if the current post has any of given tags.
+ * Checks if the current post has any of given tags.
  *
  * The given tags are checked against the post's tags' term_ids, names and slugs.
  * Tags given as integers will only be checked against the post's tags' term_ids.
@@ -1376,6 +1380,10 @@ function has_category( $category = '', $post = null ) {
  * Prior to v2.7 of WordPress, tags given as integers would also be checked against the post's tags' names and slugs (in addition to term_ids)
  * Prior to v2.7, this function could only be used in the WordPress Loop.
  * As of 2.7, the function can be used anywhere if it is provided a post ID or post object.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.6.0
  *
diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 5bcbcd674e..c44514738c 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -1181,8 +1181,12 @@ function trackback_rdf( $deprecated = '' ) {
 }
 
 /**
- * Whether the current post is open for comments.
- *
+ * Determines whether the current post is open for comments.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @param int|WP_Post $post_id Post ID or WP_Post object. Default current post.
@@ -1207,7 +1211,11 @@ function comments_open( $post_id = null ) {
 }
 
 /**
- * Whether the current post is open for pings.
+ * Determines whether the current post is open for pings.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 1.5.0
  *
diff --git a/wp-includes/deprecated.php b/wp-includes/deprecated.php
index 0b3ce28d33..89203d764c 100644
--- a/wp-includes/deprecated.php
+++ b/wp-includes/deprecated.php
@@ -2508,10 +2508,14 @@ function is_term( $term, $taxonomy = '', $parent = 0 ) {
 }
 
 /**
- * Is the current admin page generated by a plugin?
+ * Determines whether the current admin page is generated by a plugin.
  *
  * Use global $plugin_page and/or get_plugin_page_hookname() hooks.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  * @deprecated 3.1.0
  *
@@ -3713,8 +3717,12 @@ function get_comments_popup_template() {
 }
 
 /**
- * Whether the current URL is within the comments popup window.
- *
+ * Determines whether the current URL is within the comments popup window.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  * @deprecated 4.5.0
  *
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index e8751414e4..c44685e604 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -654,9 +654,13 @@ function wp_get_http_headers( $url, $deprecated = false ) {
 }
 
 /**
- * Whether the publish date of the current post in the loop is different from the
- * publish date of the previous post in the loop.
- *
+ * Determines whether the publish date of the current post in the loop is different
+ * from the publish date of the previous post in the loop.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 0.71
  *
  * @global string $currentday  The day of the current post in the loop.
@@ -1340,13 +1344,17 @@ function do_robots() {
 }
 
 /**
- * Test whether WordPress is already installed.
+ * Determines whether WordPress is already installed.
  *
  * The cache will be checked first. If you have a cache plugin, which saves
  * the cache values, then this will work. If you use the default WordPress
  * cache, and the database goes away, then you might have problems.
  *
  * Checks for the 'siteurl' option for whether WordPress is installed.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.1.0
  *
diff --git a/wp-includes/functions.wp-scripts.php b/wp-includes/functions.wp-scripts.php
index d7b5d1d0d6..efe82d9774 100644
--- a/wp-includes/functions.wp-scripts.php
+++ b/wp-includes/functions.wp-scripts.php
@@ -329,8 +329,12 @@ function wp_dequeue_script( $handle ) {
 }
 
 /**
- * Check whether a script has been added to the queue.
- *
+ * Determines whether a script has been added to the queue.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ *  
  * @since 2.8.0
  * @since 3.5.0 'enqueued' added as an alias of the 'queue' list.
  *
diff --git a/wp-includes/l10n.php b/wp-includes/l10n.php
index 56996bdc94..8df78717d5 100644
--- a/wp-includes/l10n.php
+++ b/wp-includes/l10n.php
@@ -1385,7 +1385,11 @@ function wp_dropdown_languages( $args = array() ) {
 }
 
 /**
- * Checks if current locale is RTL.
+ * Determines whether the current locale is right-to-left (RTL).
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 3.0.0
  *
diff --git a/wp-includes/load.php b/wp-includes/load.php
index 3551daf6da..64e4e447cb 100644
--- a/wp-includes/load.php
+++ b/wp-includes/load.php
@@ -701,11 +701,15 @@ function wp_clone( $object ) {
 }
 
 /**
- * Whether the current request is for an administrative interface page.
+ * Determines whether the current request is for an administrative interface page.
  *
  * Does not check if the user is an administrator; current_user_can()
  * for checking roles and capabilities.
  *
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook. 
+ *
  * @since 1.5.1
  *
  * @global WP_Screen $current_screen
diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index dda43ce658..0fc242a6b7 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -975,7 +975,11 @@ endif;
 
 if ( !function_exists('is_user_logged_in') ) :
 /**
- * Checks if the current visitor is a logged in user.
+ * Determines whether the current visitor is a logged in user.
+ *
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.0.0
  *
diff --git a/wp-includes/post-template.php b/wp-includes/post-template.php
index 9ff1d08ea4..91c2d8f660 100644
--- a/wp-includes/post-template.php
+++ b/wp-includes/post-template.php
@@ -398,7 +398,11 @@ function get_the_excerpt( $post = null ) {
 }
 
 /**
- * Whether the post has a custom excerpt.
+ * Determines whether the post has a custom excerpt.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.3.0
  *
@@ -1630,12 +1634,16 @@ function get_the_password_form( $post = 0 ) {
 }
 
 /**
- * Whether currently in a page template.
+ * Determines whether currently in a page template.
  *
  * This template tag allows you to determine if you are in a page template.
  * You can optionally provide a template name or array of template names
  * and then the check will be specific to that template.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.5.0
  * @since 4.2.0 The `$template` parameter was changed to also accept an array of page templates.
  * @since 4.7.0 Now works with any post type, not just pages.
diff --git a/wp-includes/post-thumbnail-template.php b/wp-includes/post-thumbnail-template.php
index 0dbe74aad6..3e72bb1395 100644
--- a/wp-includes/post-thumbnail-template.php
+++ b/wp-includes/post-thumbnail-template.php
@@ -10,7 +10,11 @@
  */
 
 /**
- * Check if post has an image attached.
+ * Determines whether a post has an image attached.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.9.0
  * @since 4.4.0 `$post` can be a post ID or WP_Post object.
diff --git a/wp-includes/post.php b/wp-includes/post.php
index 89b76184c3..9f2a404b30 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -999,7 +999,11 @@ function is_post_type_hierarchical( $post_type ) {
 }
 
 /**
- * Check if a post type is registered.
+ * Determines whether a post type is registered.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 3.0.0
  *
@@ -2018,11 +2022,15 @@ function get_post_custom_values( $key = '', $post_id = 0 ) {
 }
 
 /**
- * Check if post is sticky.
+ * Determines whether a post is sticky.
  *
  * Sticky posts should remain at the top of The Loop. If the post ID is not
  * given, then The Loop ID for the current post will be used.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.7.0
  *
  * @param int $post_id Optional. Post ID. Default is ID of the global $post.
@@ -4990,8 +4998,12 @@ function get_pages( $args = array() ) {
 //
 
 /**
- * Check if the attachment URI is local one and is really an attachment.
- *
+ * Determines whether an attachment URI is local and really an attachment.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.0.0
  *
  * @param string $url URL to check
@@ -5487,7 +5499,11 @@ function wp_attachment_is( $type, $post = null ) {
 }
 
 /**
- * Checks if the attachment is an image.
+ * Determines whether an attachment is an image.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.1.0
  * @since 4.2.0 Modified into wrapper for wp_attachment_is() and
diff --git a/wp-includes/query.php b/wp-includes/query.php
index 7df90a963e..8192090478 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -136,10 +136,14 @@ function wp_reset_postdata() {
  */
 
 /**
- * Is the query for an existing archive page?
+ * Determines whether the query is for an existing archive page.
  *
  * Month, Year, Category, Author, Post Type archive...
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -158,8 +162,12 @@ function is_archive() {
 }
 
 /**
- * Is the query for an existing post type archive page?
- *
+ * Determines whether the query is for an existing post type archive page.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 3.1.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -179,8 +187,12 @@ function is_post_type_archive( $post_types = '' ) {
 }
 
 /**
- * Is the query for an existing attachment page?
- *
+ * Determines whether the query is for an existing attachment page.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.0.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -200,11 +212,15 @@ function is_attachment( $attachment = '' ) {
 }
 
 /**
- * Is the query for an existing author archive page?
+ * Determines whether the query is for an existing author archive page.
  *
  * If the $author parameter is specified, this function will additionally
  * check if the query is for one of the authors specified.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -224,11 +240,15 @@ function is_author( $author = '' ) {
 }
 
 /**
- * Is the query for an existing category archive page?
+ * Determines whether the query is for an existing category archive page.
  *
  * If the $category parameter is specified, this function will additionally
  * check if the query is for one of the categories specified.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -248,10 +268,14 @@ function is_category( $category = '' ) {
 }
 
 /**
- * Is the query for an existing tag archive page?
+ * Determines whether the query is for an existing tag archive page.
  *
  * If the $tag parameter is specified, this function will additionally
  * check if the query is for one of the tags specified.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.3.0
  *
@@ -272,7 +296,7 @@ function is_tag( $tag = '' ) {
 }
 
 /**
- * Is the query for an existing custom taxonomy archive page?
+ * Determines whether the query is for an existing custom taxonomy archive page.
  *
  * If the $taxonomy parameter is specified, this function will additionally
  * check if the query is for that specific $taxonomy.
@@ -280,6 +304,10 @@ function is_tag( $tag = '' ) {
  * If the $term parameter is specified in addition to the $taxonomy parameter,
  * this function will additionally check if the query is for one of the terms
  * specified.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.5.0
  *
@@ -301,8 +329,12 @@ function is_tax( $taxonomy = '', $term = '' ) {
 }
 
 /**
- * Is the query for an existing date archive?
- *
+ * Determines whether the query is for an existing date archive.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -321,7 +353,11 @@ function is_date() {
 }
 
 /**
- * Is the query for an existing day archive?
+ * Determines whether the query is for an existing day archive.
+ *
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 1.5.0
  *
@@ -341,8 +377,12 @@ function is_day() {
 }
 
 /**
- * Is the query for a feed?
- *
+ * Determines whether the query is for a feed.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -382,7 +422,7 @@ function is_comment_feed() {
 }
 
 /**
- * Is the query for the front page of the site?
+ * Determines whether the query is for the front page of the site.
  *
  * This is for what is displayed at your site's main URL.
  *
@@ -392,7 +432,11 @@ function is_comment_feed() {
  * true when viewing that page.
  *
  * Otherwise the same as @see is_home()
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -411,7 +455,7 @@ function is_front_page() {
 }
 
 /**
- * Determines if the query is for the blog homepage.
+ * Determines whether the query is for the blog homepage.
  *
  * The blog homepage is the page that shows the time-based blog content of the site.
  *
@@ -420,7 +464,11 @@ function is_front_page() {
  *
  * If a static page is set for the front page of the site, this function will return true only
  * on the page you set as the "Posts page".
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @see is_front_page()
@@ -440,8 +488,12 @@ function is_home() {
 }
 
 /**
- * Is the query for an existing month archive?
- *
+ * Determines whether the query is for an existing month archive.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -460,11 +512,15 @@ function is_month() {
 }
 
 /**
- * Is the query for an existing single page?
+ * Determines whether the query is for an existing single page.
  *
  * If the $page parameter is specified, this function will additionally
  * check if the query is for one of the pages specified.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @see is_single()
  * @see is_singular()
  *
@@ -487,8 +543,12 @@ function is_page( $page = '' ) {
 }
 
 /**
- * Is the query for paged result and not for the first page?
- *
+ * Determines whether the query is for paged results and not for the first page.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -507,8 +567,12 @@ function is_paged() {
 }
 
 /**
- * Is the query for a post or page preview?
- *
+ * Determines whether the query is for a post or page preview.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.0.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -547,8 +611,12 @@ function is_robots() {
 }
 
 /**
- * Is the query for a search?
- *
+ * Determines whether the query is for a search.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -567,13 +635,17 @@ function is_search() {
 }
 
 /**
- * Is the query for an existing single post?
+ * Determines whether the query is for an existing single post.
  *
  * Works for any post type, except attachments and pages
  *
  * If the $post parameter is specified, this function will additionally
  * check if the query is for one of the Posts specified.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @see is_page()
  * @see is_singular()
  *
@@ -596,12 +668,16 @@ function is_single( $post = '' ) {
 }
 
 /**
- * Is the query for an existing single post of any post type (post, attachment, page,
- * custom post types)?
+ * Determines whether the query is for an existing single post of any post type
+ * (post, attachment, page, custom post types).
  *
  * If the $post_types parameter is specified, this function will additionally
  * check if the query is for one of the Posts Types specified.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @see is_page()
  * @see is_single()
  *
@@ -624,7 +700,11 @@ function is_singular( $post_types = '' ) {
 }
 
 /**
- * Is the query for a specific time?
+ * Determines whether the query is for a specific time.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 1.5.0
  *
@@ -644,7 +724,11 @@ function is_time() {
 }
 
 /**
- * Is the query for a trackback endpoint call?
+ * Determines whether the query is for a trackback endpoint call.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 1.5.0
  *
@@ -664,7 +748,11 @@ function is_trackback() {
 }
 
 /**
- * Is the query for an existing year archive?
+ * Determines whether the query is for an existing year archive.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 1.5.0
  *
@@ -684,8 +772,12 @@ function is_year() {
 }
 
 /**
- * Is the query a 404 (returns no results)?
- *
+ * Determines whether the query has resulted in a 404 (returns no results).
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 1.5.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -724,8 +816,12 @@ function is_embed() {
 }
 
 /**
- * Is the query the main query?
- *
+ * Determines whether the query is the main query.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 3.3.0
  *
  * @global WP_Query $wp_query Global WP_Query instance.
@@ -768,7 +864,11 @@ function have_posts() {
 }
 
 /**
- * Whether the caller is in the Loop.
+ * Determines whether the caller is in the Loop.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.0.0
  *
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index a612df26b4..5bf03fcb35 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -242,9 +242,13 @@ function get_taxonomy( $taxonomy ) {
 }
 
 /**
- * Checks that the taxonomy name exists.
+ * Determines whether the taxonomy name exists.
  *
  * Formerly is_taxonomy(), introduced in 2.3.0.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 3.0.0
  *
@@ -260,12 +264,16 @@ function taxonomy_exists( $taxonomy ) {
 }
 
 /**
- * Whether the taxonomy object is hierarchical.
+ * Determines whether the taxonomy object is hierarchical.
  *
  * Checks to make sure that the taxonomy is an object first. Then Gets the
  * object, and finally returns the hierarchical value in the object.
  *
  * A false return value might also mean that the taxonomy does not exist.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.3.0
  *
@@ -1265,9 +1273,13 @@ function unregister_term_meta( $taxonomy, $meta_key ) {
 }
 
 /**
- * Check if Term exists.
+ * Determines whether a term exists.
  *
  * Formerly is_term(), introduced in 2.3.0.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 3.0.0
  *
diff --git a/wp-includes/user.php b/wp-includes/user.php
index ef3bc57dea..02f64eead5 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -1314,7 +1314,11 @@ function clean_user_cache( $user ) {
 }
 
 /**
- * Checks whether the given username exists.
+ * Determines whether the given username exists.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.0.0
  *
@@ -1340,7 +1344,11 @@ function username_exists( $username ) {
 }
 
 /**
- * Checks whether the given email exists.
+ * Determines whether the given email exists.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.1.0
  *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3a3af70864..876bc0139e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-beta1-43826';
+$wp_version = '5.0-beta1-43827';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-includes/widgets.php b/wp-includes/widgets.php
index 683c7ab913..c86de84cb7 100644
--- a/wp-includes/widgets.php
+++ b/wp-includes/widgets.php
@@ -775,7 +775,7 @@ function dynamic_sidebar( $index = 1 ) {
 }
 
 /**
- * Whether widget is displayed on the front end.
+ * Determines whether a given widget is displayed on the front end.
  *
  * Either $callback or $id_base can be used
  * $id_base is the first argument when extending WP_Widget class
@@ -786,7 +786,11 @@ function dynamic_sidebar( $index = 1 ) {
  *
  * NOTE: $widget_id and $id_base are the same for single widgets. To be effective
  * this function has to run after widgets have initialized, at action {@see 'init'} or later.
- *
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.2.0
  *
  * @global array $wp_registered_widgets
@@ -822,8 +826,12 @@ function is_active_widget( $callback = false, $widget_id = false, $id_base = fal
 }
 
 /**
- * Whether the dynamic sidebar is enabled and used by theme.
- *
+ * Determines whether the dynamic sidebar is enabled and used by the theme.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.2.0
  *
  * @global array $wp_registered_widgets
@@ -845,8 +853,12 @@ function is_dynamic_sidebar() {
 }
 
 /**
- * Whether a sidebar is in use.
- *
+ * Determines whether a sidebar is in use.
+ * 
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
+ * Conditional Tags} article in the Theme Developer Handbook.
+ * 
  * @since 2.8.0
  *
  * @param string|int $index Sidebar name, id or number to check.