Merge r345064, r345065 from trunk:

Remove on/off arguments from AuthDigestProvider.


Provide at least a basic roadmap to the aaa modules as part of the tutorial.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@345066 13f79535-47bb-0310-9956-ffa450edef68