minor #7619 Making it more clear where Request::setTrustedProxies should go (weaverryan)

This PR was merged into the 2.7 branch.

Discussion
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Making it more clear where Request::setTrustedProxies should go

... And trying out the `diff` format! I know we lose the `php` formatting, but in this case, it seems superior.

Commits
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869e5d2 Making it more clear where to add the Request::setTrustedProxies line

Author: weaverryan

request/load_balancer_reverse_proxy.rst

@@ -82,14 +82,16 @@ In this case, you'll need to - *very carefully* - trust *all* proxies.
 
 #. Once you've guaranteed that traffic will only come from your trusted reverse
    proxies, configure Symfony to *always* trust incoming request. This is
-   done inside of your front controller::
+   done inside of your front controller:
+
+.. code-block:: diff
 
        // web/app.php
 
        // ...
-       Request::setTrustedProxies(array('127.0.0.1', $request->server->get('REMOTE_ADDR')));
+       $request = Request::createFromGlobals();
+       + Request::setTrustedProxies(array('127.0.0.1', $request->server->get('REMOTE_ADDR')));
 
-       $response = $kernel->handle($request);
        // ...
 
 #. Ensure that the trusted_proxies setting in your ``app/config/config.yml``