Update help banner to explain credits. Move /help first. Double help … #5508

Job	Run time
build-and-check	2m 37s
test-integration-packages/billing	1m 6s
test-integration-cli	41s
test-integration-packages/internal	39s
test-integration-packages/agent-runtime	53s
test-integration-common	40s
test-integration-web	41s
test-common	34s
test-.agents	41s
test-packages/agent-runtime	1m 1s
test-web	45s
test-integration-sdk	45s
test-packages/internal	46s
test-sdk	45s
test-packages/billing	41s
test-cli	1m 17s
	14m 32s

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