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

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


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nosy: +ezio.melotti, michael.foord, rbcollins
stage:  -> needs patch
type: enhancement -> 
versions: +Python 2.7, Python 3.4, Python 3.6

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