kpathsea SELFAUTOLOC is wrong

[Karl Berry]

    https://tug.org/tetex/html/kpathsea/kpath_13.html#SEC13

Wow, you found some impressively stale documentation :). 1995.

I changed tug.org/tetex to just be te's "de-support" notice from 14
years ago, since virtually every url mentioned on the page was 404.

I also changed tug.org/tetex/html to point to tug.org/texinfohtml, which
is still maintained (by me), which is essentially the same thing. Can't
keep the actual links working, but, in this case it's just as well
.. --best, karl.