[docs] [issue21559] OverflowError should not happen for integer operations

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9ba324a20bad by Terry Jan Reedy in branch '3.4':
Issue #21559: Add alternative (historical) reason for OverflowError.
http://hg.python.org/cpython/rev/9ba324a20bad

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nosy: +python-dev

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