Remove reference to RequireNone, which is no longer
used in the example since r1341749 (trunk)
resp. r1363816 (2.4.x).

Add some hopefully interesting other explanation
instead.

Backport of r1430814 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1430816 13f79535-47bb-0310-9956-ffa450edef68