[docs] [issue17571] broken links on Lib/datetime.py docstring

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. added the comment:

Let's just update the docstring:

"""Concrete date/time and related types.

See also http://dir.yahoo.com/Reference/calendars/

For a primer on DST, including many current DST rules, see
http://webexhibits.org/daylightsaving/

Sources for time zone and DST data: http://www.twinsun.com/tz/tz-link.htm

This was originally copied from the sandbox of the CPython CVS repository.
Thanks to Tim Peters for suggesting using it.
"""

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nosy: +fdrake

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