fix code block

Indent the complete block with three more spaces so that it is aligned properly inside the surrounding list item. Move placeholder comment to the right place.

Author: xabbuh

cookbook/request/load_balancer_reverse_proxy.rst

@@ -81,13 +81,13 @@ In this case, you'll need to - *very carefully* - trust *all* proxies.
  proxies, configure Symfony to *always* trust incoming request. This is
  done inside of your front controller::
 
- // web/app.php
- // ...
+ // web/app.php
 
- Request::setTrustedProxies(array($request->server->get('REMOTE_ADDR')));
+ // ...
+ Request::setTrustedProxies(array($request->server->get('REMOTE_ADDR')));
 
- $response = $kernel->handle($request);
- // ...
+  $response = $kernel->handle($request);
+  // ...
 
 That's it! It's critical that you prevent traffic from all non-trusted sources.
 If you allow outside traffic, they could "spoof" their true IP address and