docs: revise next.js starter docs #34581

Job	Run time
setup	1m 57s
integration-tests-packages	13m 20s
Shard (0) Module Integration Tests	11m 25s
Shard (0) HTTP Integration Tests	12m 12s
Shard (1) Module Integration Tests	9m 51s
Shard (0) Unit Tests	9m 11s
Shard (1) HTTP Integration Tests	8m 53s
Shard (1) Unit Tests	5m 19s
unit-tests	1s
integration-tests-modules	1s
integration-tests-http	1s
	1h 12m 11s

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