Docs: Add a description for the documented use of the `$wpdb` global in `_prime_comment_caches()`.

See #8071. See #32246.

Built from https://develop.svn.wordpress.org/trunk@34355


git-svn-id: http://core.svn.wordpress.org/trunk@34319 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment-functions.php

@@ -2383,8 +2383,7 @@ function update_comment_cache( $comments, $update_meta_cache = true ) {
  * @access private
  *
  * @see update_comment_cache()
- *
- * @global wpdb $wpdb
+ * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @param array $comment_ids       Array of comment IDs.
  * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34354';
+$wp_version = '4.4-alpha-34355';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.