bpo-44844: Remove unresponsive web link (pythonGH-29651)

Threading notes by Aahz from OSCON 2001.

Author: terryjreedy

Doc/faq/library.rst

@@ -240,9 +240,6 @@ Be sure to use the :mod:`threading` module and not the :mod:`_thread` module.
 The :mod:`threading` module builds convenient abstractions on top of the
 low-level primitives provided by the :mod:`_thread` module.
 
-Aahz has a set of slides from his threading tutorial that are helpful; see
-http://www.pythoncraft.com/OSCON2001/.
-
 
 None of my threads seem to run: why?
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