[docs] [issue30550] Document order-preserving dictionary output in json

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:


New changeset 4a40498ea96a3c606952712c7951b2ea4ab258e4 by Raymond Hettinger (Miss Islington (bot)) in branch '3.8':
bpo-30550: Clarify JSON ordering guarantees (GH-15397) (GH-15403)
https://github.com/python/cpython/commit/4a40498ea96a3c606952712c7951b2ea4ab258e4


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