message: fix python/examples/fit_a_line server and doc bug
diff: @@ -31,6 +31,6 @@ class UciService(WebService):
  uci_service = UciService(name="uci")
  uci_service.load_model_config("uci_housing_model")
  -uci_service.prepare_server(workdir="workdir", port=9292)
  +uci_service.prepare_server(workdir="workdir", port=9393)
  uci_service.run_rpc_service()
  uci_service.run_web_service()
  