[docs] [issue21366] Document that return in finally overwrites prev value

[Roundup Robot]

Roundup Robot added the comment:

New changeset faaa8d569664 by Zachary Ware in branch '3.4':
Issue #21366: Document the fact that ``return`` in a ``finally`` clause
http://hg.python.org/cpython/rev/faaa8d569664

New changeset 685f92aad1dc by Zachary Ware in branch 'default':
Issue #21366: Document the fact that ``return`` in a ``finally`` clause
http://hg.python.org/cpython/rev/685f92aad1dc

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nosy: +python-dev

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