[docs] [issue23702] docs.python.org/3/howto/descriptor.html still refers to "unbound methods"

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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versions: +Python 3.5, Python 3.6 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23702>
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