docs: release notes for the v20.2.0-rc.0 release #1590

Job	Run time
list	25s
workflow (build-cli)	1m 36s
workflow (modules-builder-tests)	1m 49s
workflow (devkit-core-tests-rerun)	1m 20s
workflow (build-unit-tests)	2m 17s
workflow (devkit-core-tests)	1m 17s
	8m 44s

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