docs: release notes for the v18.2.20 release #1293

Job	Run time
list	27s
workflow (build-cli)	1m 26s
workflow (devkit-core-tests)	1m 16s
workflow (build-unit-tests)	2m 10s
workflow (modules-builder-tests)	1m 56s
workflow (devkit-core-tests-rerun)	1m 23s
	8m 38s

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