Removed unnecessary use statement in code example in the debugging cookbook

Author: Alex Salguero

cookbook/debugging.rst

@@ -47,8 +47,6 @@ below::
     $loader = require_once __DIR__.'/../app/autoload.php';
     require_once __DIR__.'/../app/AppKernel.php';
 
-    use Symfony\Component\HttpFoundation\Request;
-
     $kernel = new AppKernel('dev', true);
     // $kernel->loadClassCache();
     $request = Request::createFromGlobals();