[issue39879] Update language reference to specify that dict is insertion-ordered.

[Lahfa Samy]

Lahfa Samy <lahfa121999 at gmail.com> added the comment:

Hi Furkan, would you mind to combine your revised PR with mine so that we can do as suggested by Zachary?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39879>
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