Update README.md

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Minor formatting changes in documentation to enhance readability.

📊 Key Changes

• Adjusted table formatting in README.md and README.zh-CN.md for model details.
• Reformatted JSON examples in flask_rest_api/README.md for consistency.
• Unified code block indentation in clearml/README.md.

🎯 Purpose & Impact

• 📚 Improved Clarity: Ensures information in tables and code blocks is easier to read and understand.
• 🌍 Consistency: Provides a uniform look and feel across different documentation files.
• 🔍 Better User Experience: Users will find it easier to follow instructions and understand data formats.