docs: release notes for the v20.2.2 release #8570

Job	Run time
build	1m 41s
lint	1m 29s
build-e2e-windows	1m 39s
e2e-windows	1s
publish-snapshots	1s
Browser Compatibility Tests	1s
e2e-package-managers	1s
e2e	1s
test	1s
e2e-snapshots	1s
	4m 56s

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