minor #16861 [Translation] Update locale.rst (mohamedGasmii)

This PR was submitted for the 6.0 branch but it was squashed and merged into the 5.4 branch instead.

Discussion
----------

[Translation] Update locale.rst

Adding php-attributes example.

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/releases for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `6.x` for features of unreleased versions).

-->

Commits
-------

2748e2e [Translation] Update locale.rst

Author: javiereguiluz

translation/locale.rst

@@ -85,6 +85,26 @@ A better policy is to include the locale in the URL using the
             {
             }
         }
+        
+    .. code-block:: php-attributes
+
+        // src/Controller/ContactController.php
+        namespace App\Controller;
+
+        // ...
+        class ContactController extends AbstractController
+        {
+            #[Route(
+                path: '/{_locale}/contact',
+                name: 'contact',
+                requirements: [
+                    '_locale' => 'en|fr|de',
+                ],
+            )]
+            public function contact()
+            {
+            }
+        }
 
     .. code-block:: yaml