Docs: Improve various globals documentation, as per documentation standards.

Props upadalavipul.
See #57069, #56792.


git-svn-id: https://develop.svn.wordpress.org/trunk@54953 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-debug-data.php

@@ -30,6 +30,7 @@ class WP_Debug_Data {
 	 *
 	 * @throws ImagickException
 	 * @global wpdb $wpdb WordPress database abstraction object.
+	 * @global $_wp_theme_features
 	 *
 	 * @return array The debug data for the site.
 	 */
@@ -1558,6 +1559,8 @@ class WP_Debug_Data {
 	 *
 	 * @since 5.2.0
 	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
 	 * @return int The size of the database, in bytes.
 	 */
 	public static function get_database_size() {