Feeds: Remove a confusing comment from add_feed(), added in [3638].

It always overrides the default callback if it's set, regardless of the `in_array()` check.

See #34259.

git-svn-id: https://develop.svn.wordpress.org/trunk@35121 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rewrite-functions.php

@@ -100,7 +100,6 @@ function add_feed( $feedname, $function ) {
 	global $wp_rewrite;
 
 	if ( ! in_array( $feedname, $wp_rewrite->feeds ) ) {
-		// Override the file if it is
 		$wp_rewrite->feeds[] = $feedname;
 	}