[chuck-users] GenX ugen doc issue

At http://chuck.cs.princeton.edu/doc/program/ugen_full.html#GenX, there is a reference to RTCmix which uses an obsolete link so some sort of half-forgotten documentation (redirects to http://sites.music.columbia.edu/cmc/RTcmix/). The current doc is at http://rtcmix.org/ but it appears that the makegen command is now obsolete. The closest I could find is http://rtcmix.org/reference/scorefile/maketable.php , the apparent replacement, which contains a broken link to an old makegen page. Not sure it matters, but it should probably be cleaned up. I personally appreciate the link to RTCmix because I'd never heard of it before, but it could probably be made to not be a link, or simply removed.