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

[pasenor]

Change by pasenor <gosha at fro.lv>:


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keywords: +patch
pull_requests: +14946
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15220

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37829>
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