[docs] [issue37814] typing module: empty tuple syntax is undocumented

[Josh Holland]

Change by Josh Holland <anowlcalledjosh at gmail.com>:


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pull_requests: +14981
pull_request: https://github.com/python/cpython/pull/15262

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37814>
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