Even though the Rust docs aren't built for this purpose first, in IntelliJ or CLion I can still press Ctrl + Q on a method and see the full method documentation

Even though the Rust docs aren't built for this purpose first, in IntelliJ or CLion I can still press Ctrl + Q on a method and see the full method documentation with examples. I think what IntelliJ does is simply parse the doc comment for that method and then render the markdown contained in it in the little popup. The standard docs are built from those comments as well.