[docs] [issue8810] TZ offset description is unclear in docs

[Nick Coghlan]

Nick Coghlan added the comment:

It turns out these particular docstrings are duplicated all over the place, as time and datetime both wrap the tzinfo method, and there is both the tzinfo ABC as well as the concrete fixed offset subclasses, and this happens in both C and Python.

Ben's patch currently only covers the docstrings for the Python tzinfo ABC implementation

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