Update example codeblock

Co-authored-by: Oskar Stark <[email protected]>

Author: tcoch

security.rst

@@ -2532,7 +2532,8 @@ You can also extend the ``IsGranted`` attribute to create meaningful shortcuts:
 
     class IsAdmin extends IsGranted
     {
-        public function __construct() {
+        public function __construct()
+        {
             return parent::__construct('ROLE_ADMIN');
         }
     }