[issue20301] Correct docs for default access argument for DeleteKeyEx

[Roundup Robot]

Roundup Robot added the comment:

New changeset da35a4e724e5 by Zachary Ware in branch '3.3':
Issue #20301: Mention the correct KEY_* value as the default
http://hg.python.org/cpython/rev/da35a4e724e5

New changeset 3baee069c5ff by Zachary Ware in branch 'default':
Issue #20301: Merge with 3.3
http://hg.python.org/cpython/rev/3baee069c5ff

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nosy: +python-dev

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