Fix namespace/filepath mismatch found by DOCtor-RST

- Fix SecurityController namespace from App\Controller\SecurityController to App\Controller

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Author: OskarStark

security.rst

@@ -1940,7 +1940,7 @@ You can logout user programmatically using the ``logout()`` method of the
 :class:`Symfony\\Bundle\\SecurityBundle\\Security` helper::
 
     // src/Controller/SecurityController.php
-    namespace App\Controller\SecurityController;
+    namespace App\Controller;
 
     use Symfony\Bundle\SecurityBundle\Security;