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bpo-43453: Update and re-add example to typing runtime_checkable (GH-27013)

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
(cherry picked from commit 17f94e28882e1e2b331ace93f42e8615383dee59)

Co-authored-by: andrei kulakov <andrei.avk@gmail.com>
M
Miss Islington (bot) committed
846cc4d28025ac4319069ec3c6db9526c75efd40
Parent: f3289a5
Committed by GitHub <noreply@github.com> on 7/5/2021, 8:46:02 PM