docs: release notes for the v20.3.10 release #2323

Job	Run time
build	26s
lint	2m 26s
build-e2e-windows	23s
e2e-windows	0s
test	-1s
Browser Compatibility Tests	-1s
publish-snapshots	-1s
e2e-package-managers	-1s
e2e	0s
e2e-snapshots	-1s
	3m 10s

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