[Routing] added missing @Annotation tag

src/Symfony/Component/Routing/Annotation/Route.php

@@ -14,6 +14,7 @@ namespace Symfony\Component\Routing\Annotation;
 /**
  * Annotation class for @Route().
  *
+ * @Annotation
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class Route