fixed some deprecation messages

Author: fabpot

Session/Storage/Handler/LegacyPdoSessionHandler.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
 
-@trigger_error('The '.__NAMESPACE__.'\LegacyPdoSessionHandler class is deprecated since version 2.6 and will be removed in 3.0. Use the Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler class instead.', E_USER_DEPRECATED);
+@trigger_error('The '.__NAMESPACE__.'\LegacyPdoSessionHandler class is deprecated since Symfony 2.6 and will be removed in 3.0. Use the Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler class instead.', E_USER_DEPRECATED);
 
 /**
  * Session handler using a PDO connection to read and write data.