minor #19613 [Routing] Update routing.rst (vimalgorasiya)

This PR was submitted for the 7.0 branch but it was merged into the 6.4 branch instead.

Discussion
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[Routing] Update routing.rst

Hello,

This pull request enhances the code snippets under the **Matching HTTP Methods** section by adding the missing import namespaces for Symfony components. The updated code in `src/Controller/BlogApiController.php` now includes the necessary use statements, ensuring clarity and correctness.

If further improvements or updates are needed, please let me know.

Thanks.

Commits
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e16d286 Update routing.rst

Author: javiereguiluz

routing.rst

@@ -176,7 +176,9 @@ Use the ``methods`` option to restrict the verbs each route should respond to:
         // src/Controller/BlogApiController.php
         namespace App\Controller;
 
-        // ...
+        use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+        use Symfony\Component\HttpFoundation\Response;
+        use Symfony\Component\Routing\Annotation\Route;
 
         class BlogApiController extends AbstractController
         {