Docs: Add a @since note about new parameters with the spread operator added to function signatures.

Props jrf.
See #47678.

git-svn-id: https://develop.svn.wordpress.org/trunk@46451 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post.php

@@ -1829,6 +1829,8 @@ function _add_post_type_submenus() {
  *     ) );
  *
  * @since 3.0.0
+ * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
+ *              by adding it to the function signature.
  *
  * @global array $_wp_post_type_features
  *