Weeding out some old references. Replacing w3.org/cgi with link to CGI RFC.

Replacing hoohoo.ncsa.uiuc.edu with links to CGI RFC. This fixes PR#50622


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1061423 13f79535-47bb-0310-9956-ffa450edef68