In his talk at EuroRust 2024, Francois Mockers emphasizes the importance of thorough documentation in Rust programming, particularly through tools like rustdoc and docs.rs. He outlines best practices for documenting functions, structs, and traits, highlighting the need for clarity, examples, and the inclusion of constraints not captured by the type system. Mockers also discusses advanced features of rustdoc, such as linking, code examples, and the use of HTML/CSS for enhanced documentation presentation, encouraging developers to contribute to these tools to improve the overall Rust ecosystem.