Fix --source 'path/*.jpg' glob example

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved documentation for path specifications in yolov5.

📊 Key Changes

• Enclosed the path pattern *.jpg with single quotes in README files and notebook tutorial.
• Ensured there is a newline at the end of the tutorial.ipynb file.

🎯 Purpose & Impact

• 📝 Enhances clarity in documentation, making it explicit that glob patterns should be quoted to prevent shell interpretation issues.
• 🐞 Fixes potentially unintended behaviors when users input file paths, leading to a smoother user experience.
• 🧹 Minor file formatting improvement for code consistency and standards compliance.