Update README.md

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

This PR involves multiple documentation adjustments in README files to improve consistency and formatting.

📊 Key Changes

• Minor table formatting update in README.md and README.zh-CN.md.
• Reformatted JSON example in utils/flask_rest_api/README.md for better readability.
• Tweaked code block formatting in utils/loggers/clearml/README.md.

🎯 Purpose & Impact

• Enhanced Readability: Improved table and code block formatting makes the documentation cleaner and easier to follow 📋.
• Consistency: Ensures that JSON code examples are uniformly styled, aiding clarity for developers 👩‍💻.
• User Experience: Simplifies the installation and setup instructions in the ClearML integration section, making it more user-friendly 🚀.