[docs] [issue23049] Fix functools.reduce code equivalent.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0b3d69f15950 by Raymond Hettinger in branch '3.4':
Issue #23049:  Pure python equivalent shouldn't imply more exactitude than is really there.
https://hg.python.org/cpython/rev/0b3d69f15950

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nosy: +python-dev

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