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

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

You're welcome. Feel free to close this if it answers your question.

Thanks

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