changes for special versions for sf2.3

Author: ymalcev

Tests/TestBundles/DefaultTestBundle/Entity/CustomizationEntity_sf_2_3.php

@@ -206,11 +206,6 @@ public function isPasswordLegal()
     }
 
     /**
-     * This format is no available in sf2.3
-     *
-     * #Assert\Callback(
-     *    groups={"groups_callback"}
-     * )
      * @param ExecutionContextInterface $context
      */
     public function validateCallback(ExecutionContextInterface $context)