Comments: Improve accuracy of get_comment_count() docblock.

Remove reference to uncached database query now `get_comment_count()` uses `WP_Comment_Query` which contains caching. Remove reference to `$wpdb` global, it is no longer used.

Follow up to [53036].

Fixes #19901.

Built from https://develop.svn.wordpress.org/trunk@53225


git-svn-id: http://core.svn.wordpress.org/trunk@52814 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment.php

@@ -358,12 +358,8 @@ function get_lastcommentmodified( $timezone = 'server' ) {
 /**
  * Retrieves the total comment counts for the whole site or a single post.
  *
- * Unlike wp_count_comments(), this function always returns the live comment counts without caching.
- *
  * @since 2.0.0
  *
- * @global wpdb $wpdb WordPress database abstraction object.
- *
  * @param int $post_id Optional. Restrict the comment counts to the given post. Default 0, which indicates that
  *                     comment counts for the whole site will be retrieved.
  * @return int[] {
@@ -379,8 +375,6 @@ function get_lastcommentmodified( $timezone = 'server' ) {
  * }
  */
 function get_comment_count( $post_id = 0 ) {
-	global $wpdb;
-
 	$post_id = (int) $post_id;
 
 	$comment_count = array(

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-beta2-53224';
+$wp_version = '6.0-beta2-53225';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.