[docs] [issue23025] ssl.RAND_bytes docs should mention os.urandom

[STINNER Victor]

STINNER Victor added the comment:

Note: ssl.RAND_bytes() doesn't exist in Python 2 (even in Python 2.7.9!).

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versions: +Python 3.4, Python 3.5

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<http://bugs.python.org/issue23025>
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