[docs] [issue28771] Update documented signatures of tp_get/setattr

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2fd070fa6c15 by Martin Panter in branch '2.7':
Issue #28771: Correct documentation of signatures using const
https://hg.python.org/cpython/rev/2fd070fa6c15

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28771>
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