feature: redirect query params too in RedirectController

Adding documentation for the redirectAction improvement

Author: Simperfit

routing/redirect_in_config.rst

@@ -96,7 +96,7 @@ Redirecting Using a Route
 
 Assume you are migrating your website from WordPress to Symfony, you want to
 redirect ``/wp-admin`` to the route ``sonata_admin_dashboard``. You don't know
-the path, only the route name. This can be achieved using the
+the path, only the route name, if you pass query parameters to this route and active the ``keepQueryParams``, it will be redirected too. This can be achieved using the
 :method:`Symfony\\Bundle\\FrameworkBundle\\Controller\\RedirectController::redirectAction`
 action:
 
@@ -114,6 +114,7 @@ action:
             defaults:
                 route: sonata_admin_dashboard
                 permanent: true
+                keepQueryParams: true
 
     .. code-block:: xml
 
@@ -130,6 +131,7 @@ action:
                 <default key="_controller">Symfony\Bundle\FrameworkBundle\Controller\RedirectController::redirectAction</default>
                 <default key="route">sonata_admin_dashboard</default>
                 <default key="permanent">true</default>
+                <default key="keepQueryParams">true</default>
             </route>
         </routes>
 
@@ -146,6 +148,7 @@ action:
             '_controller' => 'Symfony\Bundle\FrameworkBundle\Controller\RedirectController::redirectAction',
             'route'       => 'sonata_admin_dashboard',
             'permanent'   => true,
+            'keepQueryParams' => true,
         )));
 
         return $collection;