[docs] [issue37829] Documentation of stdlib: add example of mixed arguments to dict()

Change by pasenor <gosha@fro.lv>: ---------- keywords: +patch pull_requests: +14946 stage: -> patch review pull_request: https://github.com/python/cpython/pull/15220 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue37829> _______________________________________