Fix FAQ entry on problems with POST, plus a few cleanups. The old

entry is extremely misleading, and answering a Q that isn't really FA,
and I see someone posting somewhere every week who tries this to
fix their "method not allowed" problems.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@80861 13f79535-47bb-0310-9956-ffa450edef68