[docs] [issue34049] abs() method accept argument that implement __abs__()

[Windson Yang]

Change by Windson Yang <wiwindson at gmail.com>:


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assignee:  -> docs at python
components: +Documentation -Library (Lib)
nosy: +docs at python

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34049>
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