Iain Henderson enhanced the pi-hole/docs repository by updating its documentation to clarify environment variable configuration naming. He focused on improving user understanding by explaining that environment variables can be set using either the exact configuration name or the conventional ALL_CAPS format, providing a practical Markdown example to demonstrate their equivalence. This documentation work aimed to reduce configuration errors and streamline onboarding for new users. By aligning the documentation with existing naming conventions, Iain improved maintainability and consistency across the project. His contribution centered on technical writing and Markdown, delivering a focused, well-scoped improvement without introducing new features or addressing bug fixes.