[docs] [issue18696] In unittest.TestCase.longMessage doc remove a redundant sentence

[Ezio Melotti]

Ezio Melotti added the comment:

Agreed, closing.

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nosy: +ezio.melotti
resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18696>
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