diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index f3cdb9cc0f..8eb1c97da5 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -447,10 +447,11 @@ function get_comment_count( $post_id = 0 ) {
  * @since 2.9.0
  * @link https://developer.wordpress.org/reference/functions/add_comment_meta/
  *
- * @param int $comment_id Comment ID.
- * @param string $meta_key Metadata name.
- * @param mixed $meta_value Metadata value.
- * @param bool $unique Optional. Whether the same key should not be added. Default false.
+ * @param int    $comment_id Comment ID.
+ * @param string $meta_key   Metadata name.
+ * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
+ * @param bool   $unique     Optional. Whether the same key should not be added.
+ *                           Default false.
  * @return int|bool Meta ID on success, false on failure.
  */
 function add_comment_meta( $comment_id, $meta_key, $meta_value, $unique = false ) {
@@ -467,9 +468,11 @@ function add_comment_meta( $comment_id, $meta_key, $meta_value, $unique = false
  * @since 2.9.0
  * @link https://developer.wordpress.org/reference/functions/delete_comment_meta/
  *
- * @param int $comment_id comment ID
- * @param string $meta_key Metadata name.
- * @param mixed $meta_value Optional. Metadata value.
+ * @param int    $comment_id Comment ID.
+ * @param string $meta_key   Metadata name.
+ * @param mixed  $meta_value Optional. Metadata value. If provided,
+ *                           rows will only be removed that match the value.
+ *                           Must be serializable if non-scalar. Default empty.
  * @return bool True on success, false on failure.
  */
 function delete_comment_meta( $comment_id, $meta_key, $meta_value = '' ) {
@@ -482,11 +485,14 @@ function delete_comment_meta( $comment_id, $meta_key, $meta_value = '' ) {
  * @since 2.9.0
  * @link https://developer.wordpress.org/reference/functions/get_comment_meta/
  *
- * @param int $comment_id Comment ID.
- * @param string $key Optional. The meta key to retrieve. By default, returns data for all keys.
- * @param bool $single Optional. Whether to return a single value. Default false.
- * @return mixed Will be an array if $single is false. Will be value of meta data field if $single
- *  is true.
+ * @param int    $comment_id Comment ID.
+ * @param string $key        Optional. The meta key to retrieve. By default,
+ *                           returns data for all keys.
+ * @param bool   $single     Optional. Whether to return a single value.
+ *                           This parameter has no effect if $key is not specified.
+ *                           Default false.
+ * @return mixed An array if $single is false. The value of meta data field
+ *               if $single is true.
  */
 function get_comment_meta( $comment_id, $key = '', $single = false ) {
 	return get_metadata( 'comment', $comment_id, $key, $single );
@@ -503,11 +509,13 @@ function get_comment_meta( $comment_id, $key = '', $single = false ) {
  * @since 2.9.0
  * @link https://developer.wordpress.org/reference/functions/update_comment_meta/
  *
- * @param int $comment_id Comment ID.
- * @param string $meta_key Metadata key.
- * @param mixed $meta_value Metadata value.
- * @param mixed $prev_value Optional. Previous value to check before updating. Default empty.
- * @return int|bool Meta ID if the key didn't exist, true on successful update, false on failure.
+ * @param int    $comment_id Comment ID.
+ * @param string $meta_key   Metadata key.
+ * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
+ * @param mixed  $prev_value Optional. Previous value to check before updating.
+ *                           Default empty.
+ * @return int|bool Meta ID if the key didn't exist, true on successful update,
+ *                  false on failure.
  */
 function update_comment_meta( $comment_id, $meta_key, $meta_value, $prev_value = '' ) {
 	return update_metadata( 'comment', $comment_id, $meta_key, $meta_value, $prev_value );
diff --git a/wp-includes/deprecated.php b/wp-includes/deprecated.php
index f4e50a2a1c..12312d6449 100644
--- a/wp-includes/deprecated.php
+++ b/wp-includes/deprecated.php
@@ -2211,7 +2211,7 @@ function unregister_widget_control($id) {
  *
  * @param int $user_id User ID.
  * @param string $meta_key Metadata key.
- * @param mixed $meta_value Metadata value.
+ * @param mixed $meta_value Optional. Metadata value. Default empty.
  * @return bool True deletion completed and false if user_id is not a number.
  */
 function delete_usermeta( $user_id, $meta_key, $meta_value = '' ) {
@@ -2257,7 +2257,7 @@ function delete_usermeta( $user_id, $meta_key, $meta_value = '' ) {
  * @see get_user_meta()
  *
  * @param int $user_id User ID
- * @param string $meta_key Optional. Metadata key.
+ * @param string $meta_key Optional. Metadata key. Default empty.
  * @return mixed
  */
 function get_usermeta( $user_id, $meta_key = '' ) {
diff --git a/wp-includes/meta.php b/wp-includes/meta.php
index 73f253a840..7eee83a759 100644
--- a/wp-includes/meta.php
+++ b/wp-includes/meta.php
@@ -662,7 +662,7 @@ function get_metadata_by_mid( $meta_type, $meta_id ) {
  * @param string $meta_type  Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
  *                           or any other object type with an associated meta table.
  * @param int    $meta_id    ID for a specific meta row.
- * @param string $meta_value Metadata value.
+ * @param string $meta_value Metadata value. Must be serializable if non-scalar.
  * @param string $meta_key   Optional. You can provide a meta key to update it. Default false.
  * @return bool True on successful update, false on failure.
  */
diff --git a/wp-includes/ms-site.php b/wp-includes/ms-site.php
index 947f0e0301..d4f9a5f9d0 100644
--- a/wp-includes/ms-site.php
+++ b/wp-includes/ms-site.php
@@ -385,7 +385,7 @@ function update_site_cache( $sites, $update_meta_cache = true ) {
  * @since 5.1.0
  *
  * @param array $site_ids List of site IDs.
- * @return array|false Returns false if there is nothing to update. Returns an array of metadata on success.
+ * @return array|false An array of metadata on success, false if there is nothing to update.
  */
 function update_sitemeta_cache( $site_ids ) {
 	// Ensure this filter is hooked in even if the function is called early.
@@ -1059,8 +1059,9 @@ function add_site_meta( $site_id, $meta_key, $meta_value, $unique = false ) {
  *
  * @param int    $site_id    Site ID.
  * @param string $meta_key   Metadata name.
- * @param mixed  $meta_value Optional. Metadata value. Must be serializable if
- *                           non-scalar. Default empty.
+ * @param mixed  $meta_value Optional. Metadata value. If provided,
+ *                           rows will only be removed that match the value.
+ *                           Must be serializable if non-scalar. Default empty.
  * @return bool True on success, false on failure.
  */
 function delete_site_meta( $site_id, $meta_key, $meta_value = '' ) {
@@ -1073,11 +1074,13 @@ function delete_site_meta( $site_id, $meta_key, $meta_value = '' ) {
  * @since 5.1.0
  *
  * @param int    $site_id Site ID.
- * @param string $key     Optional. The meta key to retrieve. By default, returns
- *                        data for all keys. Default empty.
- * @param bool   $single  Optional. Whether to return a single value. Default false.
- * @return mixed Will be an array if $single is false. Will be value of meta data
- *               field if $single is true.
+ * @param string $key     Optional. The meta key to retrieve. By default,
+ *                        returns data for all keys. Default empty.
+ * @param bool   $single  Optional. Whether to return a single value.
+ *                        This parameter has no effect if $key is not specified.
+ *                        Default false.
+ * @return mixed An array if $single is false. The value of meta data field
+ *               if $single is true.
  */
 function get_site_meta( $site_id, $key = '', $single = false ) {
 	return get_metadata( 'blog', $site_id, $key, $single );
diff --git a/wp-includes/option.php b/wp-includes/option.php
index 156c2ad3f2..b38ea66109 100644
--- a/wp-includes/option.php
+++ b/wp-includes/option.php
@@ -452,7 +452,8 @@ function update_option( $option, $value, $autoload = null ) {
  * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @param string         $option      Name of option to add. Expected to not be SQL-escaped.
- * @param mixed          $value       Optional. Option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
+ * @param mixed          $value       Optional. Option value. Must be serializable if non-scalar.
+ *                                    Expected to not be SQL-escaped.
  * @param string         $deprecated  Optional. Description. Not used anymore.
  * @param string|bool    $autoload    Optional. Whether to load the option when WordPress starts up.
  *                                    Default is enabled. Accepts 'no' to disable for legacy reasons.
@@ -747,8 +748,8 @@ function get_transient( $transient ) {
  *
  * @since 2.8.0
  *
- * @param string $transient  Transient name. Expected to not be SQL-escaped. Must be
- *                           172 characters or fewer in length.
+ * @param string $transient  Transient name. Expected to not be SQL-escaped.
+ *                           Must be 172 characters or fewer in length.
  * @param mixed  $value      Transient value. Must be serializable if non-scalar.
  *                           Expected to not be SQL-escaped.
  * @param int    $expiration Optional. Time until expiration in seconds. Default 0 (no expiration).
diff --git a/wp-includes/post.php b/wp-includes/post.php
index 262f986221..87de98d0ff 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -2090,8 +2090,9 @@ function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
  *
  * @param int    $post_id    Post ID.
  * @param string $meta_key   Metadata name.
- * @param mixed  $meta_value Optional. Metadata value. Must be serializable if
- *                           non-scalar. Default empty.
+ * @param mixed  $meta_value Optional. Metadata value. If provided,
+ *                           rows will only be removed that match the value.
+ *                           Must be serializable if non-scalar. Default empty.
  * @return bool True on success, false on failure.
  */
 function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
@@ -2110,12 +2111,13 @@ function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
  * @since 1.5.0
  *
  * @param int    $post_id Post ID.
- * @param string $key     Optional. The meta key to retrieve. By default, returns
- *                        data for all keys. Default empty.
- * @param bool   $single  Optional. If true, returns only the first value for the specified meta key.
- *                        This parameter has no effect if $key is not specified. Default false.
- * @return mixed Will be an array if $single is false. Will be value of the meta
- *               field if $single is true.
+ * @param string $key     Optional. The meta key to retrieve. By default,
+ *                        returns data for all keys. Default empty.
+ * @param bool   $single  Optional. Whether to return a single value.
+ *                        This parameter has no effect if $key is not specified.
+ *                        Default false.
+ * @return mixed An array if $single is false. The value of the meta field
+ *               if $single is true.
  */
 function get_post_meta( $post_id, $key = '', $single = false ) {
 	return get_metadata( 'post', $post_id, $key, $single );
@@ -2136,9 +2138,10 @@ function get_post_meta( $post_id, $key = '', $single = false ) {
  * @param int    $post_id    Post ID.
  * @param string $meta_key   Metadata key.
  * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
- * @param mixed  $prev_value Optional. Previous value to check before updating. Default empty.
- * @return int|bool The new meta field ID if a field with the given key didn't exist and was
- *                  therefore added, true on successful update, false on failure.
+ * @param mixed  $prev_value Optional. Previous value to check before updating.
+ *                           Default empty.
+ * @return int|bool Meta ID if the key didn't exist, true on successful update,
+ *                  false on failure.
  */
 function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
 	// Make sure meta is added to the post, not a revision.
@@ -6766,8 +6769,7 @@ function update_post_caches( &$posts, $post_type = 'post', $update_term_cache =
  * @since 2.1.0
  *
  * @param int[] $post_ids Array of post IDs.
- * @return array|false Returns false if there is nothing to update or an array
- *                     of metadata.
+ * @return array|false An array of metadata on success, false if there is nothing to update.
  */
 function update_postmeta_cache( $post_ids ) {
 	return update_meta_cache( 'post', $post_ids );
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index 0d257c0e7f..3dc33122d8 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -1211,11 +1211,11 @@ function get_terms( $args = array(), $deprecated = '' ) {
  *
  * @param int    $term_id    Term ID.
  * @param string $meta_key   Metadata name.
- * @param mixed  $meta_value Metadata value.
- * @param bool   $unique     Optional. Whether to bail if an entry with the same key is found for the term.
+ * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
+ * @param bool   $unique     Optional. Whether the same key should not be added.
  *                           Default false.
- * @return int|WP_Error|bool Meta ID on success. WP_Error when term_id is ambiguous between taxonomies.
- *                           False on failure.
+ * @return int|false|WP_Error Meta ID on success, false on failure.
+ *                            WP_Error when term_id is ambiguous between taxonomies.
  */
 function add_term_meta( $term_id, $meta_key, $meta_value, $unique = false ) {
 	if ( wp_term_is_shared( $term_id ) ) {
@@ -1232,7 +1232,9 @@ function add_term_meta( $term_id, $meta_key, $meta_value, $unique = false ) {
  *
  * @param int    $term_id    Term ID.
  * @param string $meta_key   Metadata name.
- * @param mixed  $meta_value Optional. Metadata value. If provided, rows will only be removed that match the value.
+ * @param mixed  $meta_value Optional. Metadata value. If provided,
+ *                           rows will only be removed that match the value.
+ *                           Must be serializable if non-scalar. Default empty.
  * @return bool True on success, false on failure.
  */
 function delete_term_meta( $term_id, $meta_key, $meta_value = '' ) {
@@ -1245,10 +1247,13 @@ function delete_term_meta( $term_id, $meta_key, $meta_value = '' ) {
  * @since 4.4.0
  *
  * @param int    $term_id Term ID.
- * @param string $key     Optional. The meta key to retrieve. If no key is provided, fetches all metadata for the term.
- * @param bool   $single  Optional. Whether to return a single value. If false, an array of all values matching the
- *                        `$term_id`/`$key` pair will be returned. Default false.
- * @return mixed If `$single` is false, an array of metadata values. If `$single` is true, a single metadata value.
+ * @param string $key     Optional. The meta key to retrieve. By default,
+ *                        returns data for all keys. Default empty.
+ * @param bool   $single  Optional. Whether to return a single value.
+ *                        This parameter has no effect if $key is not specified.
+ *                        Default false.
+ * @return mixed An array if $single is false. The value of the meta field
+ *               if $single is true.
  */
 function get_term_meta( $term_id, $key = '', $single = false ) {
 	return get_metadata( 'term', $term_id, $key, $single );
@@ -1265,10 +1270,12 @@ function get_term_meta( $term_id, $key = '', $single = false ) {
  *
  * @param int    $term_id    Term ID.
  * @param string $meta_key   Metadata key.
- * @param mixed  $meta_value Metadata value.
- * @param mixed  $prev_value Optional. Previous value to check before updating. Default empty.
- * @return int|WP_Error|bool Meta ID if the key didn't previously exist. True on successful update.
- *                           WP_Error when term_id is ambiguous between taxonomies. False on failure.
+ * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
+ * @param mixed  $prev_value Optional. Previous value to check before updating.
+ *                           Default empty.
+ * @return int|bool|WP_Error Meta ID if the key didn't exist. true on successful update,
+ *                           false on failure. WP_Error when term_id is ambiguous
+ *                           between taxonomies.
  */
 function update_term_meta( $term_id, $meta_key, $meta_value, $prev_value = '' ) {
 	if ( wp_term_is_shared( $term_id ) ) {
@@ -1287,7 +1294,7 @@ function update_term_meta( $term_id, $meta_key, $meta_value, $prev_value = '' )
  * @since 4.4.0
  *
  * @param array $term_ids List of term IDs.
- * @return array|false Returns false if there is nothing to update. Returns an array of metadata on success.
+ * @return array|false An array of metadata on success, false if there is nothing to update.
  */
 function update_termmeta_cache( $term_ids ) {
 	return update_meta_cache( 'term', $term_ids );
diff --git a/wp-includes/user.php b/wp-includes/user.php
index 2223e7a40e..4404a4b90b 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -786,8 +786,9 @@ function is_user_member_of_blog( $user_id = 0, $blog_id = 0 ) {
  *
  * @param int    $user_id    User ID.
  * @param string $meta_key   Metadata name.
- * @param mixed  $meta_value Metadata value.
- * @param bool   $unique     Optional. Whether the same key should not be added. Default false.
+ * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
+ * @param bool   $unique     Optional. Whether the same key should not be added.
+ *                           Default false.
  * @return int|false Meta ID on success, false on failure.
  */
 function add_user_meta( $user_id, $meta_key, $meta_value, $unique = false ) {
@@ -806,7 +807,9 @@ function add_user_meta( $user_id, $meta_key, $meta_value, $unique = false ) {
  *
  * @param int    $user_id    User ID
  * @param string $meta_key   Metadata name.
- * @param mixed  $meta_value Optional. Metadata value.
+ * @param mixed  $meta_value Optional. Metadata value. If provided,
+ *                           rows will only be removed that match the value.
+ *                           Must be serializable if non-scalar. Default empty.
  * @return bool True on success, false on failure.
  */
 function delete_user_meta( $user_id, $meta_key, $meta_value = '' ) {
@@ -820,9 +823,13 @@ function delete_user_meta( $user_id, $meta_key, $meta_value = '' ) {
  * @link https://developer.wordpress.org/reference/functions/get_user_meta/
  *
  * @param int    $user_id User ID.
- * @param string $key     Optional. The meta key to retrieve. By default, returns data for all keys.
- * @param bool   $single  Optional. Whether to return a single value. Default false.
- * @return mixed Will be an array if $single is false. Will be value of meta data field if $single is true.
+ * @param string $key     Optional. The meta key to retrieve. By default,
+ *                        returns data for all keys.
+ * @param bool   $single  Optional. Whether to return a single value.
+ *                        This parameter has no effect if $key is not specified.
+ *                        Default false.
+ * @return mixed An array if $single is false. The value of meta data field
+ *               if $single is true.
  */
 function get_user_meta( $user_id, $key = '', $single = false ) {
 	return get_metadata( 'user', $user_id, $key, $single );
@@ -841,9 +848,11 @@ function get_user_meta( $user_id, $key = '', $single = false ) {
  *
  * @param int    $user_id    User ID.
  * @param string $meta_key   Metadata key.
- * @param mixed  $meta_value Metadata value.
- * @param mixed  $prev_value Optional. Previous value to check before updating. Default empty.
- * @return int|bool Meta ID if the key didn't exist, true on successful update, false on failure.
+ * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
+ * @param mixed  $prev_value Optional. Previous value to check before updating.
+ *                           Default empty.
+ * @return int|bool Meta ID if the key didn't exist, true on successful update,
+ *                  false on failure.
  */
 function update_user_meta( $user_id, $meta_key, $meta_value, $prev_value = '' ) {
 	return update_metadata( 'user', $user_id, $meta_key, $meta_value, $prev_value );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b814c6c17d..3a34aed8f4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47610';
+$wp_version = '5.5-alpha-47611';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.