[issue17259] Document round half to even rule for floats

[Terry J. Reedy]

Terry J. Reedy added the comment:

'%.0f' % 5.5, etc, does the same. I agree that consistent 3.x half to even is both correct and and in need of better doc to avoid repeated questions and invalid bug reports.

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nosy: +terry.reedy
title: locale.format() rounding is not reliable for floats -> Document round half to even rule for floats
versions:  -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17259>
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