What is the documentation system in Rust?
In Rust, documentation is an important part of writing code. Rust has a built-in documentation system called Rustdoc that allows developers to document their code with comments and generate HTML documentation that can be viewed in a web browser.
Rustdoc uses a syntax for documenting code called "Rustdoc comments." Rustdoc comments start with /// and are placed immediately above the documented item, such as a function, struct, or module.
