[docs] [issue17539] Use the builtins module in the unittest.mock.patch example

[Roundup Robot]

Roundup Robot added the comment:

New changeset b0c0a03b8033 by Ezio Melotti in branch '3.3':
#17539: fix MagicMock example.  Patch by Berker Peksag.
http://hg.python.org/cpython/rev/b0c0a03b8033

New changeset d5d6209745ab by Ezio Melotti in branch 'default':
#17539: merge with 3.3.
http://hg.python.org/cpython/rev/d5d6209745ab

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nosy: +python-dev

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