Add formatting for file and method names

Author: Patrick McAndrew

cookbook/request/load_balancer_reverse_proxy.rst

@@ -83,8 +83,8 @@ In this case, you'll need to - *very carefully* - trust *all* proxies.
        $response = $kernel->handle($request);
        // ...
 
-#. Ensure that the trusted_proxies setting in your app/config/config.yml is not set or 
-   it will overwrite the setTrustedProxies call above.
+#. Ensure that the trusted_proxies setting in your ``app/config/config.yml`` is not set or 
+   it will overwrite the ``setTrustedProxies`` call above.
 
 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