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

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

I agree with Yury's suggestions; the entry in the "Dictionary view objects" section, that Cheryl points to, is not sufficient.  Is somebody willing to write a PR?

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priority: normal -> high
stage:  -> needs patch
type: enhancement -> 

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