[docs] [issue34549] unittest docs could use another header

[Nick]

Nick <manifes7o at gmail.com> added the comment:

Ah, yes! Was searching for one of those helpful "Permalink to this ___" options. Didn't even see the link at the top.

Thank you!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34549>
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