[docs] [issue12245] Document the meaning of FLT_ROUNDS constants for sys.float_info

[Mark Dickinson]

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

Patch that elaborates a bit on the meaning of sys.float_info.rounds.

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keywords: +patch
Added file: http://bugs.python.org/file22454/issue12245.patch

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