One more place updated
//!
//! The user level documentation can be found [here].
//!
-//! [here]: https://japaric.github.io/rtfm5/book/en/
+//! [here]: https://rtfm.rs
//!
//! Don't forget to check the documentation of the `#[app]` attribute (listed under the reexports
//! section), which is the main component of the framework.
