More entity quoting.

<p></p> & <a></a> cleanup.
Removed link to mod_cookies.html (missing in 2.0).
Fixed <a name="#.
Fixed link to fragment removed from mod_proxy.html.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88377 13f79535-47bb-0310-9956-ffa450edef68