fixed some deprecation messages

Author: fabpot

Exception/NonceExpiredException.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\Security\Core\Exception;
 
-@trigger_error(sprintf('The %s class and the whole HTTP digest authentication system is deprecated since 3.4 and will be removed in 4.0.', NonceExpiredException::class), E_USER_DEPRECATED);
+@trigger_error(sprintf('The %s class and the whole HTTP digest authentication system is deprecated since Symfony 3.4 and will be removed in 4.0.', NonceExpiredException::class), E_USER_DEPRECATED);
 
 /**
  * NonceExpiredException is thrown when an authentication is rejected because