[sd] Clean up server flags. NFC. (#1048)

Clarify the format of device IDs.

Author: kuhar

shortfin/python/shortfin_apps/sd/server.py

@@ -297,7 +297,7 @@ def main(argv, log_config=UVICORN_LOG_CONFIG):
         type=str,
         required=True,
         choices=["local-task", "hip", "amdgpu"],
-        help="Primary inferencing device",
+        help="Primary inferencing device.",
     )
     parser.add_argument(
         "--target",
@@ -312,7 +312,7 @@ def main(argv, log_config=UVICORN_LOG_CONFIG):
         type=str,
         nargs="*",
         default=None,
-        help="Device IDs visible to the system builder. Defaults to None (full visibility). Can be an index or a sf device id like amdgpu:0:0@0",
+        help="Device IDs visible to the system builder. Defaults to None (full visibility). Can be an IREE index or a device id like GPU-66613339-3934-3261-3131-396338323735.",
     )
     parser.add_argument(
         "--tokenizers",