docs: release notes for the v21.2.22 release #11048

Job	Run time
lint	1m 45s
build	2m 11s
build-e2e-windows	2m 21s
test	1m 32s
Browser Compatibility Tests	1m 33s
publish-snapshots	1m 32s
e2e-windows (24, esbuild, 0)	1m 18s
e2e-windows (24, esbuild, 3)	1m 17s
e2e-windows (24, esbuild, 1)	1m 18s
e2e-windows (24, esbuild, 2)	1m 9s
e2e-windows (24, webpack, 5)	1m 18s
e2e-windows (24, esbuild, 4)	1m 20s
e2e-windows (24, webpack, 1)	1m 10s
e2e-windows (24, webpack, 3)	1m 21s
e2e-windows (24, webpack, 2)	1m 19s
e2e-windows (24, esbuild, 5)	1m 12s
e2e-windows (24, webpack, 4)	1m 20s
e2e-windows (24, webpack, 0)	1m 20s
e2e-snapshots	1s
e2e	1s
e2e-package-managers	1s
	26m 19s

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