[docs] [issue26805] Refer to types.SimpleNamespace in namedtuple documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset c3232d1d8ca0 by Paul Moore in branch 'default':
Mention types.SimpleNamespace in collections.namedtuple doc
https://hg.python.org/cpython/rev/c3232d1d8ca0

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nosy: +python-dev

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