docs: added restock notification guide #34619

Job	Run time
setup	2m 4s
integration-tests-packages	13m 31s
Shard (0) HTTP Integration Tests	12m 39s
Shard (1) HTTP Integration Tests	9m 16s
Shard (0) Unit Tests	9m 14s
Shard (0) Module Integration Tests	11m 37s
Shard (1) Unit Tests	5m 19s
Shard (1) Module Integration Tests	9m 45s
unit-tests	1s
integration-tests-modules	1s
integration-tests-http	1s
	1h 13m 28s

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