Reformat Markdown code blocks (#12795)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

docs/en/models/yolov8.md

@@ -139,16 +139,16 @@ Note the below example is for YOLOv8 [Detect](../tasks/detect.md) models for obj
         from ultralytics import YOLO
 
         # Load a COCO-pretrained YOLOv8n model
-        model = YOLO('yolov8n.pt')
+        model = YOLO("yolov8n.pt")
 
         # Display model information (optional)
         model.info()
 
         # Train the model on the COCO8 example dataset for 100 epochs
-        results = model.train(data='coco8.yaml', epochs=100, imgsz=640)
+        results = model.train(data="coco8.yaml", epochs=100, imgsz=640)
 
         # Run inference with the YOLOv8n model on the 'bus.jpg' image
-        results = model('path/to/bus.jpg')
+        results = model("path/to/bus.jpg")
         ```
 
     === "CLI"