Add @since annotation for 'orderby' values introduced in [31236].

See #28688.

git-svn-id: https://develop.svn.wordpress.org/trunk@31237 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/taxonomy.php

@@ -2554,6 +2554,7 @@ function wp_delete_category( $cat_ID ) {
  * Retrieves the terms associated with the given object(s), in the supplied taxonomies.
  *
  * @since 2.3.0
+ * @since 4.2.0 Added support for 'taxonomy', 'parent', and 'term_taxonomy_id' values of $orderby.
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *