[Frontend] improve vllm serve --help display (#18643)

Signed-off-by: reidliu41 <reid201711@gmail.com>
Co-authored-by: reidliu41 <reid201711@gmail.com>

vllm/entrypoints/cli/main.py

@@ -9,7 +9,7 @@ import vllm.entrypoints.cli.collect_env
 import vllm.entrypoints.cli.openai
 import vllm.entrypoints.cli.serve
 import vllm.version
-from vllm.entrypoints.utils import cli_env_setup
+from vllm.entrypoints.utils import VLLM_SERVE_PARSER_EPILOG, cli_env_setup
 from vllm.utils import FlexibleArgumentParser
 
 CMD_MODULES = [
@@ -32,7 +32,10 @@ def register_signal_handlers():
 def main():
     cli_env_setup()
 
-    parser = FlexibleArgumentParser(description="vLLM CLI")
+    parser = FlexibleArgumentParser(
+        description="vLLM CLI",
+        epilog=VLLM_SERVE_PARSER_EPILOG,
+    )
     parser.add_argument('-v',
                         '--version',
                         action='version',