minor #7662 Update request_context.rst (krlove)

This PR was submitted for the 3.2 branch but it was merged into the 2.7 branch instead (closes #7662).

Discussion
----------

Update request_context.rst

Commits
-------

d445612 Update request_context.rst

Author: xabbuh

console/request_context.rst

@@ -54,7 +54,7 @@ will override the defaults.
 
     .. code-block:: php
 
-        // app/config/config_test.php
+        // app/config/parameters.php
         $container->setParameter('router.request_context.host', 'example.org');
         $container->setParameter('router.request_context.scheme', 'https');
         $container->setParameter('router.request_context.base_url', 'my/path');