docs: release notes for the v20.3.16 release #2992

Job	Run time
list	25s
workflow (devkit-core-tests-rerun)	1m 29s
workflow (build-cli)	2m 3s
workflow (modules-builder-tests)	1m 54s
workflow (build-unit-tests)	2m 16s
workflow (devkit-core-tests)	1m 24s
	9m 31s

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