Replace inline comments with docstrings

[glenn-jocher]

🛠️ PR Summary

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🌟 Summary

Refactor and documentation enhancement for the YOLOv5 codebase. 📘✨

📊 Key Changes

• 📝 Improved docstrings and comments across multiple files for better clarity and developer guidance.
• 💡 Introduced more descriptive initialization method comments in models/experimental.py and other modules.
• 🧹 Cleaned up and standardized function definitions with clearer explanations of parameters and return values.
• 🚀 Enhanced code readability and maintainability throughout the YOLOv5 codebase.

🎯 Purpose & Impact

• 📖 The changes aim to make the YOLOv5 codebase more user-friendly and accessible to developers, easing future contributions and modifications.
• 👍 Users can now better understand the purpose and usage of individual functions and classes, potentially resulting in fewer issues and questions for maintainers.
• ⏱️ Some functions, like fuse(), are documented to potentially improve inference speed, bringing performance benefits to end users.