title: How to link to other fns/structs/enums/traits in rustdoc?
body: <p>I'm building a Rust library and want to give it some polish. In the rustdoc, I'd sometimes like to <em>link</em> to other parts of the library within the docs, e.g. <code>fn</code>s, <code>trait</code>s or <code>struct</code>s. What is the official syntax for this?</p>