docs: fix claude authentication command #508

Job	Run time
smoke-test (Dockerfile.gemini, -gemini, gemini, --acp)	3m 27s
smoke-test (Dockerfile.claude, -claude, claude-agent-acp)	3m 32s
smoke-test (Dockerfile.codex, -codex, codex-acp)	3m 38s
smoke-test (Dockerfile.copilot, -copilot, copilot, --acp)	3m 41s
smoke-test (Dockerfile, kiro-cli, acp --trust-all-tools)	3m 29s
smoke-test (Dockerfile.cursor, -cursor, cursor-agent, acp)	3m 53s
smoke-test (Dockerfile.opencode, -opencode, opencode, acp)	3m 30s
	25m 10s

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