Reworked and added examples to the HTTPProtocolOptions doc

Reworked and added examples to the HTTPProtocolOptions doc

On #httpd-dev a user gave us some hints about what kind of
things would have been great to see in the HTTPProtocolOptions
directive's documentation, so I tried to apply them all.

I also added some examples taken from http_strict.t and tested
a bit. I didn't follow completely the complete change-set of
the HTTPProtocolOptions directive, so please review the change
and let me know if anything is wrong or missing.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1779927 13f79535-47bb-0310-9956-ffa450edef68