Docs: Correct return type for `get_post_custom()`.

Props chouby, audrasjb.
Fixes #55249.
See #54729.

Built from https://develop.svn.wordpress.org/trunk@52795


git-svn-id: http://core.svn.wordpress.org/trunk@52384 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -2591,7 +2591,9 @@ function unregister_post_meta( $post_type, $meta_key ) {
  * @since 1.2.0
  *
  * @param int $post_id Optional. Post ID. Default is the ID of the global `$post`.
- * @return array Post meta for the given post.
+ * @return mixed An array of values.
+ *               False for an invalid `$post_id` (non-numeric, zero, or negative value).
+ *               An empty string if a valid but non-existing post ID is passed.
  */
 function get_post_custom( $post_id = 0 ) {
 	$post_id = absint( $post_id );

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52794';
+$wp_version = '6.0-alpha-52795';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.