docs: release notes for the v21.2.20 release #10876

Job	Run time
build	2m 32s
lint	1m 43s
build-e2e-windows	2m 33s
e2e-windows (24, esbuild, 3)	2m 15s
e2e-windows (24, esbuild, 1)	2m 16s
e2e-windows (24, esbuild, 5)	2m 16s
e2e-windows (24, esbuild, 0)	2m 15s
e2e-windows (24, webpack, 5)	2m 16s
e2e-windows (24, esbuild, 4)	2m 15s
e2e-windows (24, webpack, 3)	2m 7s
e2e-windows (24, esbuild, 2)	2m 14s
e2e-windows (24, webpack, 0)	2m 15s
e2e-windows (24, webpack, 4)	2m 14s
e2e-windows (24, webpack, 1)	2m 15s
e2e-windows (24, webpack, 2)	2m 15s
publish-snapshots	2m 11s
Browser Compatibility Tests	2m 11s
test	2m 0s
e2e-snapshots	1s
e2e-package-managers	1s
e2e	1s
	40m 6s

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