[issue44957] typing docs: Mention PEP 604 syntax more prominently

[Sebastian Rittau]

Change by Sebastian Rittau <srittau at rittau.biz>:


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keywords: +patch
pull_requests: +26297
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27833

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<https://bugs.python.org/issue44957>
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