docs: fix usage of AdminCreateProduct in validation of digital product recipe #29064

Job	Run time
setup	1m 44s
Shard (0) Unit Tests	7m 17s
Shard (1) Unit Tests	5m 14s
integration-tests-packages	9m 11s
Shard (0) HTTP Integration Tests	7m 48s
Shard (0) Module Integration Tests	8m 17s
Shard (1) HTTP Integration Tests	6m 12s
Shard (1) Module Integration Tests	7m 19s
unit-tests	1s
integration-tests-http	1s
integration-tests-modules	1s
	53m 5s

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