[docs] [issue9305] Don't use east/west of UTC in date/time documentation

[anatoly techtonik]

anatoly techtonik <techtonik at gmail.com> added the comment:

> Documenting utcoffset() as "Return timedelta equal to local UTC
> offset." is almost circular.  It does not explain whether it has to be
> added or subtracted from UTC to arrive at local time.

Ok. Sold.

>> I believe the correct convention is "Return timedelta...".
>
> This is handled inconsistently in the documentation; I'm hoping the
> current maintainers reinforce the "Returns ..." structure.  The
> documentation is descriptive, not an external specification.

http://www.python.org/dev/peps/pep-0257/#one-line-docstrings

I've took the convention from here. I thought docs are generated from
docstrings.

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