updated docs

docs/Security.md

@@ -36,16 +36,37 @@ to the firewalls section of config/packages/security.yaml
 ### Modify the controller
 
 ```php
-$error = $authenticationUtils->getLastAuthenticationError();
+<?php
+
+namespace App\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;
+
+class LoginController extends AbstractController
+{
+    #[Route('/login', name: 'app_login')]
+    public function index(AuthenticationUtils $authenticationUtils): Response
+    {
+        $error = $authenticationUtils->getLastAuthenticationError();
         $lastUsername = $authenticationUtils->getLastUsername();
+
         return $this->render('login/index.html.twig', [
             'last_username' => $lastUsername,
             'error'         => $error,
         ]);
+    }
+}
 ```
 
 ### Modify the template
 ```php
+{% extends '@nytwig/master.html.twig' %}
+
+{% block title %}Hello LoginController!{% endblock %}
+
 {% block content %}
 {% if error %}
         <div>{{ error.messageKey|trans(error.messageData, 'security') }}</div>