remove comment as suggested in review

plugins/Diagnostics/Controller.php

@@ -13,12 +13,6 @@ use Piwik\Piwik;
 use Piwik\View;
 use Piwik\Settings;
 
-/**
- * A controller let's you for example create a page that can be added to a menu. For more information read our guide
- * http://developer.piwik.org/guides/mvc-in-piwik or have a look at the our API references for controller and view:
- * http://developer.piwik.org/api-reference/Piwik/Plugin/Controller and
- * http://developer.piwik.org/api-reference/Piwik/View
- */
 class Controller extends \Piwik\Plugin\ControllerAdmin
 {
     /**