[docs] [issue18800] Document Fraction's numerator and denominator properties

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


----------
keywords: +easy
nosy: +mark.dickinson, rhettinger
stage:  -> needs patch
versions: +Python 2.7, Python 3.4

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18800>
_______________________________________