docs: release notes for the v20.3.7 release #2173

Job	Run time
list	23s
workflow (devkit-core-tests)	1m 28s
workflow (devkit-core-tests-rerun)	1m 19s
workflow (build-unit-tests)	2m 25s
workflow (build-cli)	1m 46s
workflow (modules-builder-tests)	1m 47s
	9m 8s

Provide feedback