Update Freebuff limited mode FAQ #6634

Job	Run time
build-and-check	2m 50s
test-integration-packages/internal	1m 1s
test-integration-packages/billing	1m 16s
test-integration-sdk	1m 16s
test-integration-web	50s
test-integration-cli	51s
test-integration-packages/agent-runtime	40s
test-common	53s
test-packages/internal	50s
test-integration-common	40s
test-packages/agent-runtime	41s
test-.agents	42s
test-cli	50s
test-packages/billing	39s
test-sdk	47s
test-web	57s
	15m 43s

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