chore: add docs and example for multi region stacks #540

Job	Run time
Build and Test	1m 57s
comment-notification	0s
Run lint	40s
integration-test / acceptance-tests (3, 1)	10m 43s
integration-test / acceptance-tests (3, 0)	20m 16s
acceptance-test / acceptance-tests (3, 0)	1h 0m 57s
acceptance-test / acceptance-tests (3, 1)	35m 36s
integration-test / acceptance-tests (3, 2)	21m 31s
acceptance-test / acceptance-tests (3, 2)	8m 14s
sentinel	2s
	2h 39m 56s

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