[SkyServe] Doc with vllm example #11811

Job	Run time
python-test (3.8, tests/unit_tests)	5m 0s
python-test (3.8, tests/test_api.py)	2m 32s
python-test (3.8, tests/test_cli.py)	2m 38s
python-test (3.8, tests/test_config.py)	2m 33s
python-test (3.8, tests/test_global_user_state.py)	2m 33s
python-test (3.8, tests/test_jobs.py)	2m 47s
python-test (3.8, tests/test_list_accelerators.py)	2m 30s
python-test (3.8, tests/test_optimizer_dryruns.py)	4m 16s
python-test (3.8, tests/test_optimizer_random_dag.py)	3m 24s
python-test (3.8, tests/test_storage.py)	2m 31s
python-test (3.8, tests/test_wheels.py)	2m 37s
python-test (3.8, tests/test_spot.py)	2m 29s
python-test (3.8, tests/test_yaml_parser.py)	2m 47s
	38m 37s

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