ultralytics 8.0.91 tracker fix and docs comments (#2343)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>

docs/tasks/classify.md

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 Image classification is the simplest of the three tasks and involves classifying an entire image into one of a set of
 predefined classes.
 

docs/tasks/detect.md

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 Object detection is a task that involves identifying the location and class of objects in an image or video stream.
 
 <img width="1024" src="https://user-images.githubusercontent.com/26833433/212094133-6bb8c21c-3d47-41df-a512-81c5931054ae.png">

docs/tasks/index.md

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 # Ultralytics YOLOv8 Tasks
 
 YOLOv8 is an AI framework that supports multiple computer vision **tasks**. The framework can be used to

docs/tasks/pose.md

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 Pose estimation is a task that involves identifying the location of specific points in an image, usually referred
 to as keypoints. The keypoints can represent various parts of the object such as joints, landmarks, or other distinctive
 features. The locations of the keypoints are usually represented as a set of 2D `[x, y]` or 3D `[x, y, visible]`

docs/tasks/segment.md

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 Instance segmentation goes a step further than object detection and involves identifying individual objects in an image
 and segmenting them from the rest of the image.