[docs] [issue18566] In unittest.TestCase docs for setUp() and tearDown() don't mention AssertionError

[Nitika Agarwal]

Nitika Agarwal added the comment:

Hi,
I am attaching a patch with the changes made as suggested by py.user.

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nosy: +nitika
Added file: http://bugs.python.org/file34550/document18566.patch

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