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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In 2.7 all is the same except that there is the sq_ass_slice slot and the PySequence_SetSlice() function.

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Added file: http://bugs.python.org/file41370/setattr-2.7.patch

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