[docs] [issue18553] os.isatty() is not Unix only

[STINNER Victor]

STINNER Victor added the comment:

Why only changing Python 2 documentation?

http://docs.python.org/dev/library/os.html#os.isatty
still mention "Availability: Unix."

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nosy: +haypo

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<http://bugs.python.org/issue18553>
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