fix: Run server command. Closes #1143

Author: abetlen

examples/high_level_api/fastapi_server.py

@@ -9,7 +9,7 @@
 
 Then run:
 ```
-uvicorn llama_cpp.server.app:app --reload
+uvicorn --factory llama_cpp.server.app:create_app --reload
 ```
 
 or