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

[Joannah Nanjekye]

Joannah Nanjekye <nanjekyejoannah at gmail.com> added the comment:

I just referenced another area that may need help updating/improving doc strings.

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