[docs] [issue17866] TestCase.assertItemsEqual exists in 2.7, not in 3.3

[Roundup Robot]

Roundup Robot added the comment:

New changeset d9921cb6e3cd by Ezio Melotti in branch '2.7':
#17866: mention that in Python 3, assertItemsEqual is named assertCountEqual.
http://hg.python.org/cpython/rev/d9921cb6e3cd

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nosy: +python-dev

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