TorchScript, ONNX, CoreML Export tutorial title

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated the YOLOv5 README to reflect new or modified features.

📊 Key Changes

• Removed the mention of ONNX and TorchScript Export from the feature list in the README.

🎯 Purpose & Impact

• The removal might indicate that ONNX and TorchScript Export support has become a standard feature in YOLOv5, and thus no longer highlighted as a distinct feature.
• Current and potential users can have a more streamlined understanding of YOLOv5 capabilities without confusion regarding support for these export options.
• The impact is largely informational and could potentially indicate a maturation of the feature within the codebase.