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bpo-44490: Add 'Whats New' docs regarding types.Union changes (GH-27215) (GH-27368)

(cherry picked from commit 6c1b57d958e2b0d5bcf0f2315b5044838e11638f)

Co-authored-by: Yurii Karabas <1998uriyyo@gmail.com>
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Miss Islington (bot) committed
4a5457d5d48e6563ec481daad245ff3d6ef13503
Parent: 256d97c
Committed by GitHub <noreply@github.com> on 7/26/2021, 7:32:05 PM