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

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset de1ecda2afa2 by Mark Dickinson in branch '2.7':
Issue #12245: Document sys.float_info.rounds better.
http://hg.python.org/cpython/rev/de1ecda2afa2

New changeset 795c184b0282 by Mark Dickinson in branch '3.2':
Issue #12245: Document sys.float_info.rounds better.
http://hg.python.org/cpython/rev/795c184b0282

New changeset 5e45dfc421e4 by Mark Dickinson in branch 'default':
Issue #12245 merge.
http://hg.python.org/cpython/rev/5e45dfc421e4

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nosy: +python-dev

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