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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 8585ec9b761947aae6be5f653a5b9ddef2801d58 by Miss Islington (bot) in branch '3.7':
bpo-33609: Document dict insertion order guarantee as of 3.7 (GH-7093)
https://github.com/python/cpython/commit/8585ec9b761947aae6be5f653a5b9ddef2801d58


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nosy: +miss-islington

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