[docs] [issue24842] Mention SimpleNamespace in namedtuple docs

[Akira Li]

Akira Li added the comment:

People do have problems that SimpleNamespace can solve:

- Why Python does not support record type i.e. mutable namedtuple [1]
- Does Python have anonymous classes? [2]
- How to create inline objects with properties in Python? [3]
- python create object and add attributes to it [4]

[1] http://stackoverflow.com/questions/5227839/why-python-does-not-support-record-type-i-e-mutable-namedtuple
[2] http://stackoverflow.com/questions/1123000/does-python-have-anonymous-classes
[3] http://stackoverflow.com/questions/1528932/how-to-create-inline-objects-with-properties-in-python
[4] http://stackoverflow.com/questions/2827623/python-create-object-and-add-attributes-to-it

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nosy: +akira

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