Aligning with version 6.0

Author: ThomasLandauer

routing.rst

@@ -183,11 +183,11 @@ the ``BlogController``:
             ;
         };
 
-.. versionadded:: 5.1
+.. note::
 
-    Starting from Symfony 5.1, by default Symfony only loads the routes defined
-    in YAML format. If you define routes in XML and/or PHP formats, update the
-    ``src/Kernel.php`` file to add support for the ``.xml`` and ``.php`` file extensions.
+    By default Symfony only loads the routes defined in YAML format. If you
+    define routes in XML and/or PHP formats, update the ``src/Kernel.php`` file
+    to add support for the ``.xml`` and ``.php`` file extensions.
 
 .. _routing-matching-http-methods: