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

[Roundup Robot]

Changes by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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pull_requests: +3729

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