minor #10421 fix code example (xabbuh)

This PR was merged into the 2.8 branch.

Discussion
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fix code example

Commits
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7c82782 fix code example

Author: xabbuh

deployment/proxies.rst

@@ -137,27 +137,29 @@ these (see ":doc:`/components/http_foundation/trusting_proxies`").
 
 The code for doing this will need to live in your front controller (e.g. ``web/app.php``).
 
-My Reverse Proxy Does not Provide All the Standards Headers
------------------------------------------------------------
+.. _my-reverse-proxy-does-not-provide-all-the-standards-headers:
+
+My Reverse Proxy Does not Provide All the Standard Headers
+----------------------------------------------------------
 
 AWS Elastic Load Balancing for example does not provide the ``X-Forwarded-Host``
 and ``X-Forwarded`` HTTP headers, so you must make the following changes in the
-front controller::
+front controller:
 
-    .. code-block:: diff
+.. code-block:: diff
 
-        // web/app.php
+    // web/app.php
 
-        // ...
-        $request = Request::createFromGlobals();
-        // be very careful with the next line; see "But what if the IP of my Reverse Proxy Changes Constantly!"
-        + Request::setTrustedProxies(array('127.0.0.1', $request->server->get('REMOTE_ADDR')));
-        // the next line is needed because AWS ELB doesn't send X-Forwarded-Host
-        + Request::setTrustedHeaderName(Request::HEADER_CLIENT_HOST, null);
-        // the next line is needed because AWS ELB doesn't use RFC 7239
-        + Request::setTrustedHeaderName(Request::HEADER_FORWARDED, null);
+    // ...
+    $request = Request::createFromGlobals();
+    // be very careful with the next line; see "But what if the IP of my Reverse Proxy Changes Constantly!"
+    + Request::setTrustedProxies(array('127.0.0.1', $request->server->get('REMOTE_ADDR')));
+    // the next line is needed because AWS ELB doesn't send X-Forwarded-Host
+    + Request::setTrustedHeaderName(Request::HEADER_CLIENT_HOST, null);
+    // the next line is needed because AWS ELB doesn't use RFC 7239
+    + Request::setTrustedHeaderName(Request::HEADER_FORWARDED, null);
 
-        // ...
+    // ...
 
 .. _`security groups`: http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-groups.html
 .. _`RFC 7239`: http://tools.ietf.org/html/rfc7239