[issue46104] Reduce use of old-style syntax in typing docs

[Alex Waygood]

Change by Alex Waygood <Alex.Waygood at Gmail.com>:


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pull_requests: +28424
pull_request: https://github.com/python/cpython/pull/30203

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46104>
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