[docs] [issue24842] Mention SimpleNamespace in namedtuple docs

[Stefan Behnel]

Stefan Behnel added the comment:

> Also, the uptake for SNs are nearly zero.

That suggests to me that pointing users to it could help. It's currently hidden in the types module and if I didn't know it existed, I could end up looking in collections, and failing to find it there, write my own.

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nosy: +scoder

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<http://bugs.python.org/issue24842>
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