General: Add comment explaining use of queried object in feed_links_extra() instead of global $post.

Follow-up to [61056].

Props mukesh27, westonruter.
See #63263.


git-svn-id: https://develop.svn.wordpress.org/trunk@61058 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/general-template.php

@@ -3326,6 +3326,10 @@ function feed_links_extra( $args = array() ) {
 	 */
 	$args = apply_filters( 'feed_links_extra_args', $args );
 
+	/*
+	 * The template conditionals are referring to the global query, so the queried object is used rather than
+	 * depending on a global $post being set.
+	 */
 	$queried_object = get_queried_object();
 	if ( is_singular() && $queried_object instanceof WP_Post ) {
 		$post = $queried_object;