[issue17504] Dropping duplicated docstring explanation of what Mocks' side_effect does.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9445505389cf by Ezio Melotti in branch '3.3':
#17504: remove duplicated sentence.  Patch by Radu Voicilas.
http://hg.python.org/cpython/rev/9445505389cf

New changeset 2fc34f3dbc9d by Ezio Melotti in branch 'default':
#17504: merge with 3.3.
http://hg.python.org/cpython/rev/2fc34f3dbc9d

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nosy: +python-dev

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