[docs] [issue39130] Dict is reversable from v3.8 and should say that in the doc

Change by miss-islington <mariatta.wijaya+miss-islington@gmail.com>: ---------- pull_requests: +17270 pull_request: https://github.com/python/cpython/pull/17848 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue39130> _______________________________________