Add --half arguments to export.py Usage examples

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved export script guidance with half-precision support info.

📊 Key Changes

• Added a command line argument --half to include half-precision (FP16) inference in the post-export messages.
• Reorganized the post-export message to include the --half argument where applicable.

🎯 Purpose & Impact

• Provide Clearer Guidance: The messages displayed after exporting models now include instructions on how to perform inference in half-precision mode, making it clearer for users who want to use this feature.
• Enhanced User Experience: Users get immediate, post-export instructions with the correct flags for half-precision, improving the ease of transition to testing and validation steps.
• Potential Performance Boost: The half-precision inference can potentially improve performance on supported hardware, offering faster inference times and reduced model size.

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