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

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:


New changeset 9b0d4d04a15a97a1055f1b729f14e9257f149fd3 by Yury Selivanov (Miss Islington (bot)) in branch '3.7':
bpo-33609: small wording fixes to dict ordering docs (#7497)
https://github.com/python/cpython/commit/9b0d4d04a15a97a1055f1b729f14e9257f149fd3


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