The Cygwin/X web site is stored in sourceware.org CVS. The CVS root is ext:sourceware.org:/cvs/cygwin/htdocs/xfree.
A simple way of updating the documentation from the cywin-x-doc package shown on the web site is to build the documentation directly into a CVS checkout of web-site and then check it in.
$ cvs co ext:user@sourceware.org:/cvs/cygwin/htdocs/xfree [...] $ cd xfree/docs $ path-to-cygwin-x-doc/configure --enable-hardcopy $ make $ cvs up [...] $ cvs ci |