docs: release notes for the v20.1.0-rc.0 release #1388

Job	Run time
list	33s
workflow (devkit-core-tests)	1m 11s
workflow (build-cli)	1m 26s
workflow (modules-builder-tests)	1m 38s
workflow (devkit-core-tests-rerun)	1m 15s
workflow (build-unit-tests)	2m 19s
	8m 22s

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