[docs] [issue33609] Document that dicts preserve insertion order

[Eric Atkin]

Eric Atkin <eatkin at omnisolutions.biz> added the comment:

It seems the note at the bottom for `object.__hash__(self)` [1] should be updated as well.

[1] https://docs.python.org/3/reference/datamodel.html#object.__hash__

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nosy: +Eric Atkin

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<https://bugs.python.org/issue33609>
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