Merge r1554276, r1554281 from trunk:

    digest auth is only marginally more secure than basic auth.
    Adjust the docs to today's reality.

    mention insecure password storage as pointed out by Graham



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1555538 13f79535-47bb-0310-9956-ffa450edef68