Improve syntax highlight which is already nicer in 2.4.x

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1926185 13f79535-47bb-0310-9956-ffa450edef68

Author: Christophe Jaillet

docs/manual/mod/mod_proxy.xml

@@ -606,8 +606,8 @@ proxied resources</description>
     (unnamed) backreferences are ignored. Use named groups instead.</p>
 
 <highlight language="config">
-&lt;ProxyMatch ^http://(?&lt;sitename&gt;[^/]+)&gt;
-    require ldap-group cn=%{env:MATCH_SITENAME},ou=combined,o=Example
+&lt;ProxyMatch "^http://(?&lt;sitename&gt;[^/]+)"&gt;
+    Require ldap-group cn=%{env:MATCH_SITENAME},ou=combined,o=Example
 &lt;/ProxyMatch&gt;
 </highlight>
 </usage>