docs: release notes for the v21.2.18 release #10649

Job	Run time
lint	2m 1s
build-e2e-windows	2m 37s
build	2m 31s
Browser Compatibility Tests	1m 49s
test	1m 48s
publish-snapshots	1m 48s
e2e-windows (24, esbuild, 0)	1m 31s
e2e-windows (24, esbuild, 2)	1m 32s
e2e-windows (24, esbuild, 4)	1m 41s
e2e-windows (24, esbuild, 3)	1m 32s
e2e-windows (24, webpack, 1)	1m 40s
e2e-windows (24, esbuild, 1)	1m 41s
e2e-windows (24, webpack, 5)	1m 27s
e2e-windows (24, webpack, 2)	1m 33s
e2e-windows (24, webpack, 4)	1m 35s
e2e-windows (24, webpack, 0)	1m 40s
e2e-windows (24, webpack, 3)	1m 37s
e2e-windows (24, esbuild, 5)	1m 29s
e2e-package-managers	1s
e2e	1s
e2e-snapshots	1s
	31m 35s

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