ultralytics 8.0.91 tracker fix and docs comments (#2343)

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Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>

docs/modes/benchmark.md

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 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">
 
 **Benchmark mode** is used to profile the speed and accuracy of various export formats for YOLOv8. The benchmarks

docs/modes/export.md

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 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">
 
 **Export mode** is used for exporting a YOLOv8 model to a format that can be used for deployment. In this mode, the

docs/modes/index.md

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 # Ultralytics YOLOv8 Modes
 
 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">

docs/modes/predict.md

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 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">
 
 YOLOv8 **predict mode** can generate predictions for various tasks, returning either a list of `Results` objects or a

docs/modes/track.md

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 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">
 
 Object tracking is a task that involves identifying the location and class of objects, then assigning a unique ID to

docs/modes/train.md

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 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">
 
 **Train mode** is used for training a YOLOv8 model on a custom dataset. In this mode, the model is trained using the

docs/modes/val.md

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 <img width="1024" src="https://github.com/ultralytics/assets/raw/main/yolov8/banner-integrations.png">
 
 **Val mode** is used for validating a YOLOv8 model after it has been trained. In this mode, the model is evaluated on a