[docs] [issue28911] Clarify the behaviour of assert_called_once_with

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy:  -153957
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28911>
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