Add new models to docs

[yeahme49]

Yolov7-640, Yolov7-320, Yolov7x-640 and Yolov7x-320 models got added to the download_yolo.sh script that gets used as part of generating tensorrt models so they can now be generated

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[SuperMaximus1984]

@yeahme49
Please advise what may go wrong.
I try to generate YoloV7-640 model using command:
docker run --gpus=all --rm -it -v pwd/trt-models:/tensorrt_models -v pwd/tensorrt_models.sh:/tensorrt_models.sh nvcr.io/nvidia/tensorrt:22.07-py3 /tensorrt_models.sh -e YOLO_MODELS=yolov7x-640

But YoloV7x-640.trt was not generated, although I see YoloV7x weights getting downloaded during the script execution process.
I only get these files in my /trt-models/ catalogue:

libyolo_layer.so
yolov4-tiny-288.trt
yolov4-tiny-416.trt
yolov7-tiny-416.trt

Am I missing something?

Besides, are there any plans for YoloV8 and/or Yolo-NAS TensorRT models?
Thanks!