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

[pasenor]

New submission from pasenor <gosha at fro.lv>:

The following use of the dict() function with both positional and keyword arguments  does follow from the description, but probably needs it's own example:

dict({'a': 1}, b=2}) == {'a': 1, 'b': 2}

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assignee: docs at python
components: Documentation
messages: 349446
nosy: docs at python, pasenor
priority: normal
severity: normal
status: open
title: Documentation of stdlib: add example of mixed arguments to dict()
versions: Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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