[docs] [issue9430] Document str() and repr() of timedelta.

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

I think it would be clearer if the footnote said something like "Negative 1 day plus 19 hours is equivalent to the timedelta argument of -5 hours)". If I hadn't been following the discussion on #python-dev the point of this doc change would have been lost on me without much closer scrutiny, so a little more explanation would help.

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nosy: +eric.smith

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<http://bugs.python.org/issue9430>
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