Tweak getting started docs #5478

Job	Run time
build-and-check	2m 28s
test-.agents	46s
test-cli	1m 17s
test-packages/billing	44s
test-packages/agent-runtime	54s
test-packages/internal	52s
test-common	38s
test-integration-packages/billing	47s
test-integration-.agents	37s
test-integration-common	40s
test-integration-packages/agent-runtime	37s
test-integration-web	46s
test-web	43s
test-integration-cli	40s
test-integration-sdk	39s
test-sdk	51s
test-integration-packages/internal	40s
	14m 39s

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