[issue38352] In typing docs, note explicit import needed for IO and Pattern/Match

[Jelle Zijlstra]

Change by Jelle Zijlstra <jelle.zijlstra at gmail.com>:


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keywords: +patch
pull_requests: +24508
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/25821

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<https://bugs.python.org/issue38352>
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