[issue37814] typing module: empty tuple syntax is undocumented

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

> What is better, Tuple[()] or Literal[()]?

In this context, Tuple[()] is better, as the discussion is about how to write the type of various tuples. Tuple[()] is just the edge case of the type of the empty tuple.

Josh, please sign the CLA and adjust the wording per my request in the PR.

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<https://bugs.python.org/issue37814>
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