Remove legacy "Check for user comment"

I don't think these comments are necessary anymore and therefore they should get killed.

settings/ajax/changegroupname.php

@@ -1,9 +1,7 @@
 <?php
-// Check if we are a user
 
 OCP\JSON::callCheck();
 OC_JSON::checkLoggedIn();
-
 OCP\JSON::checkAdminUser();
 
 $l=OC_L10N::get('core');
@@ -23,4 +21,4 @@ if(OC_Group::setGroupname($groupname)) {
 	);
 } else {
 	OC_JSON::error(array("data" => array( "message" => $l->t("Unable to change group name"))));
-}
+}