[docs] [issue20018] Replace dead URL with link to mirror

[Roundup Robot]

Roundup Robot added the comment:

New changeset 656a40666937 by Benjamin Peterson in branch '3.3':
update url to spec (closes #20018)
http://hg.python.org/cpython/rev/656a40666937

New changeset c0dc1400866a by Benjamin Peterson in branch '2.7':
update url to spec (closes #20018)
http://hg.python.org/cpython/rev/c0dc1400866a

New changeset 5f5e1d408c0c by Benjamin Peterson in branch 'default':
merge 3.3 (#20018)
http://hg.python.org/cpython/rev/5f5e1d408c0c

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nosy: +python-dev
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20018>
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