diff --git a/wp-cron.php b/wp-cron.php
index 489550dedc..98bb1a4b28 100644
--- a/wp-cron.php
+++ b/wp-cron.php
@@ -54,7 +54,7 @@ if ( ! defined( 'ABSPATH' ) ) {
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @return string|false Value of the `doing_cron` transient, 0|false otherwise.
+ * @return string|int|false Value of the `doing_cron` transient, 0|false otherwise.
  */
 function _get_cron_lock() {
 	global $wpdb;
diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index f09c54ee96..d2ad7373f2 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -1315,7 +1315,7 @@ function _wp_render_title_tag() {
  *                            Default '»'.
  * @param bool   $display     Optional. Whether to display or retrieve title. Default true.
  * @param string $seplocation Optional. Location of the separator ('left' or 'right').
- * @return string|void String when `$display` is true, nothing otherwise.
+ * @return string|void String when `$display` is false, nothing otherwise.
  */
 function wp_title( $sep = '»', $display = true, $seplocation = '' ) {
 	global $wp_locale;
@@ -1636,7 +1636,7 @@ function single_term_title( $prefix = '', $display = true ) {
  *
  * @param string $prefix  Optional. What to display before the title.
  * @param bool   $display Optional. Whether to display or retrieve title. Default true.
- * @return string|void Title when retrieving.
+ * @return string|false|void False if there's no valid title for the month. Title when retrieving.
  */
 function single_month_title( $prefix = '', $display = true ) {
 	global $wp_locale;
diff --git a/wp-includes/post.php b/wp-includes/post.php
index fd4abd459a..288704c66d 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -3368,9 +3368,9 @@ function wp_delete_post( $postid = 0, $force_delete = false ) {
 	 *
 	 * @since 4.4.0
 	 *
-	 * @param bool|null $delete       Whether to go forward with deletion.
-	 * @param WP_Post   $post         Post object.
-	 * @param bool      $force_delete Whether to bypass the Trash.
+	 * @param WP_Post|false|null $delete       Whether to go forward with deletion. @TODO description
+	 * @param WP_Post            $post         Post object.
+	 * @param bool               $force_delete Whether to bypass the Trash.
 	 */
 	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
 	if ( null !== $check ) {
@@ -6344,9 +6344,9 @@ function wp_delete_attachment( $post_id, $force_delete = false ) {
 	 *
 	 * @since 5.5.0
 	 *
-	 * @param bool|null $delete       Whether to go forward with deletion.
-	 * @param WP_Post   $post         Post object.
-	 * @param bool      $force_delete Whether to bypass the Trash.
+	 * @param WP_Post|false|null $delete       Whether to go forward with deletion. @TODO description
+	 * @param WP_Post            $post         Post object.
+	 * @param bool               $force_delete Whether to bypass the Trash.
 	 */
 	$check = apply_filters( 'pre_delete_attachment', null, $post, $force_delete );
 	if ( null !== $check ) {
diff --git a/wp-includes/revision.php b/wp-includes/revision.php
index 06701eb89c..8f1d82ac02 100644
--- a/wp-includes/revision.php
+++ b/wp-includes/revision.php
@@ -447,7 +447,7 @@ function wp_restore_post_revision( $revision_id, $fields = null ) {
  * @since 2.6.0
  *
  * @param int|WP_Post $revision_id Revision ID or revision object.
- * @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success.
+ * @return WP_Post|false|null Null or false if error, deleted post object if success.
  */
 function wp_delete_post_revision( $revision_id ) {
 	$revision = wp_get_post_revision( $revision_id );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index dd6524c2fe..5f186cd322 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-beta3-53299';
+$wp_version = '6.0-beta3-53300';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.