Fix device

docs/Normal.md

@@ -12,7 +12,7 @@ from ultralytics import YOLO
 
 # Load a model
 model = YOLO("yolov8n.pt")  # load a pretrained model (recommended for training)
-success = model.export(format="engine")  # export the model to engine format
+success = model.export(format="engine", device=0)  # export the model to engine format
 assert success
 ```
 
@@ -21,7 +21,7 @@ After executing the above script, you will get an engine named `yolov8n.engine`
 ### 2. CLI tools
 
 ```shell
-yolo export model=yolov8n.pt format=engine
+yolo export model=yolov8n.pt format=engine device=0
 ```
 
 After executing the above command, you will get an engine named `yolov8n.engine` too.