Update README.md and README.zh-CN.md

[xhx787]

When predicts, the configure 'data' means the details obout dataset such as label and the 'source' means the picture chosen to detect.
When I run the code given by readme, the module predicts all the files in the default directory.
You should pay attention to this.

copilot:all

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Adjustment of command line examples in READMEs for consistency and clarity.

📊 Key Changes

• Updated command line examples replacing --data flag with --source in both English and Chinese README files.

🎯 Purpose & Impact

• Consistency: Ensures all command examples use the same flag for specifying input, which makes understanding and using the codebase easier.
• Clarity: Clarifies the purpose of the flag to new users, indicating it's meant for the input source (e.g., an image file) rather than a dataset or data configuration.
• User Experience: Improved documentation leads to a smoother onboarding process for new users, minimizes confusion, and decreases the potential for user errors.

[github-actions]

👋 Hello @xhx787, thank you for submitting a YOLOv5 🚀 PR! To allow your work to be integrated as seamlessly as possible, we advise you to:

• ✅ Verify your PR is up-to-date with ultralytics/yolov5 master branch. If your PR is behind you can update your code by clicking the 'Update branch' button or by running git pull and git merge master locally.
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• ✅ Reduce changes to the absolute minimum required for your bug fix or feature addition. "It is not daily increase but daily decrease, hack away the unessential. The closer to the source, the less wastage there is." — Bruce Lee

[glenn-jocher]

@xhx787 thank you yes you are right, these are good corrections!