[docs] [issue24548] Broken link in the unittest documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5f279db087e7 by R David Murray in branch '2.7':
#24548: replace dead link with pointer to archive.org.
https://hg.python.org/cpython/rev/5f279db087e7

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nosy: +python-dev

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<http://bugs.python.org/issue24548>
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