[issue8564] Update documentation on doctest/unittest2 integration

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I can’t tell if the code is correct (we can trust Michael about that), but the wording and the content are ok for me.

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nosy: +merwok

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8564>
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