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

[Ned Deily]

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


New changeset f822549653d8d09bffff5b7dcddfdf12679a787c by Ned Deily (INADA Naoki) in branch 'master':
bpo-33609: Document dict insertion order guarantee as of 3.7 (GH-7093)
https://github.com/python/cpython/commit/f822549653d8d09bffff5b7dcddfdf12679a787c


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