Merge branch '5.4' into 6.0

* 5.4:
  Update README.markdown
  Update route from annotation to attribute

Author: javiereguiluz

README.markdown

@@ -23,7 +23,7 @@ We love contributors! For more information on how you can contribute, please rea
 the [Symfony Docs Contributing Guide](https://symfony.com/doc/current/contributing/documentation/overview.html)
 
 **Important**: use `4.4` branch as the base of your pull requests, unless you are
-documenting a feature that was introduced *after* Symfony 4.4 (e.g. in Symfony 5.2).
+documenting a feature that was introduced *after* Symfony 4.4 (e.g. in Symfony 5.4).
 
 Build Documentation Locally
 ---------------------------

mailer.rst

@@ -289,9 +289,7 @@ and create an :class:`Symfony\\Component\\Mime\\Email` object::
 
     class MailerController extends AbstractController
     {
-        /**
-         * @Route("/email")
-         */
+        #[Route('/email')]
         public function sendEmail(MailerInterface $mailer): Response
         {
             $email = (new Email())