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

[Martin Panter]

Martin Panter added the comment:

I agree it might be safer not to document that PyObject_SetAttr etc can delete (move that change to the tp_setattro etc method slot). I’ll also review the other functions you mentioned when I get a chance.

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