Add reference to Httpd repository

Guides/jenkins.md

@@ -35,6 +35,8 @@ The best way to secure _Jenkins_ is to use the proxy with _Apache_.
 
 [Jenkins wiki : running Jenkins behind Apache](https://wiki.jenkins.io/display/JENKINS/Running+Jenkins+behind+Apache)
 
+See the _JovianHttpd_ repository to see the template for configuration.
+
 ## Trouble shooting
 
 ### Logs