Fixed typo

src/Symfony/Component/HttpFoundation/SessionStorage/ArraySessionStorage.php

@@ -14,7 +14,7 @@ namespace Symfony\Component\HttpFoundation\SessionStorage;
 /**
  * ArraySessionStorage mocks the session for unit tests.
  *
- * When doing functional testing, you should use FilesystemArrayStorage instead.
+ * When doing functional testing, you should use FilesystemSessionStorage instead.
  *
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Bulat Shakirzyanov <mallluhuct@gmail.com>