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bpo-43977: Update pattern matching language reference docs (GH-25917)

* Update patma language reference with new changes to sequence and mapping

* update 3.10 whatsnew too
K
Ken Jin committed
53c91ac5253bf1cb3cb20e1345e798a53f4c3517
Parent: ddd30b2
Committed by GitHub <noreply@github.com> on 5/14/2021, 5:31:28 AM