Conversion to XHTML.

The plan is to continue converting the rest of the docs to XHTML, so if you
have any objections, please voice them now on apache-docs.

Submitted by:	James Sutherland <jas88@cam.ac.uk>
Reviewed by:	Joshua Slive, William A. Rowe, Jr.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88982 13f79535-47bb-0310-9956-ffa450edef68