[docs] Clean up dead links in the docs

[Ashwin Vishnu]

Hi,

I took some time to filter out all the links and check them using cURL
with the script attached. The full output (test_links.log) is also
attached, and ignoring the links which returned 200, we get:

$ grep -v 200 test_links.log

https://pythonhosted.org/pyobjc/ 404
https://www.jwz.org/doc/content-length.html 403
https://www.jwz.org/doc/content-length.html 403
https://www.jwz.org/doc/content-length.html 403
http://www.catb.org/~esr/fetchmail/fetchmail-FAQ.html 000
https://cnswww.cns.cwru.edu/php/chet/readline/rluserman.html#SEC9 000
http://tcl.activestate.com/ 000
http://www.tldp.org/HOWTO/XML-RPC-HOWTO/index.html 000
https://www.microsoft.com/com/ 404
http://oldwiki.mingw.org/index.php/Python        0.000000e+00xtensions 404
http://catb.org/~esr/trove/ 000
http://sphinx-doc.org/examples.html 404
https://hg.python.org/cpython/file/3.2/Misc/NEWS 504
https://parlab.eecs.berkeley.edu/wiki/_media/patterns/paraplop_g1_3.pdf 500
http://greenteapress.com/semaphores/downey08semaphores.pdf 404
http://hginit.com 000


I think a good majority of the above links are dead. Please find an
alternative for those links in the docs.

Best,
Ashwin Vishnu Mohanan

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