[docs] [issue25701] Document that tp_setattro and tp_setattr are used for deleting attributes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think the conclusion of Python_Dev discussion is that it is not worth to deprecate this behavior in the code. Current behavior of  PyObject_SetAttr and PySequence_SetItem should be documented with a deprecation notice.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25701>
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