[docs] [issue37973] improve docstrings of sys.float_info

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Unhelpful indeed. +1 to updating those docstrings to match the details at docs.python.org.

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nosy: +mark.dickinson

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37973>
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