Merge r345057 from trunk:

Remove on/off from the argument list for AuthBasicProvider,
attempt to clarify the discussion of AuthBasicAuthoritative,
and add some extra clarifications in a few places.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@345059 13f79535-47bb-0310-9956-ffa450edef68