docs: release notes for the v19.2.20 release #3012

Job	Run time
list	21s
workflow (build-unit-tests)	2m 42s
workflow (build-cli)	1m 44s
workflow (modules-builder-tests)	2m 2s
workflow (devkit-core-tests)	1m 34s
workflow (devkit-core-tests-rerun)	1m 29s
	9m 52s

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