Man Rust is the shit! The compiler will build markdown documentation for you from comments in your code if you want it to! I have heard of stuff like this in other languages but never realized how powerful it is, a major problem in development is lack of documentation, and that is usually because the maintainers do not want to sit down and build documents. If you can do it while building though it makes everything so much easier.
A single stone killed almost 98% of dinosaurs. So yes, you can kill more than two birds with a stone.
Maybe it could be easy to document functions and variables while coding. Unfortunately, apart of go (where the lint is forcing you to do ) , I don't see such a trend around....