ultralytics 8.2.2 replace COCO128 with COCO8 (#10167)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

docs/en/datasets/segment/index.md

@@ -77,13 +77,13 @@ The `train` and `val` fields specify the paths to the directories containing the
         model = YOLO('yolov8n-seg.pt')  # load a pretrained model (recommended for training)
 
         # Train the model
-        results = model.train(data='coco128-seg.yaml', epochs=100, imgsz=640)
+        results = model.train(data='coco8-seg.yaml', epochs=100, imgsz=640)
         ```
     === "CLI"
 
         ```bash
         # Start training from a pretrained *.pt model
-        yolo detect train data=coco128-seg.yaml model=yolov8n-seg.pt epochs=100 imgsz=640
+        yolo detect train data=coco8-seg.yaml model=yolov8n-seg.pt epochs=100 imgsz=640
         ```
 
 ## Supported Datasets