[issue46120] Add note to `typing.Union` that it is recommended to use `|` instead

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:


New changeset 1b30660c3b40da557050948ac8635f2dc50c4ee2 by Nikita Sobolev in branch 'main':
bpo-46120: State that `|` is preferred over `Union` (GH-30222)
https://github.com/python/cpython/commit/1b30660c3b40da557050948ac8635f2dc50c4ee2


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nosy: +gregory.p.smith

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