(doc) Fixed modifiers remote link
//!
//! The modifiers are applied depending on their type. Currently the easiest
//! way to see how different types are used as modifiers, take a look at [the
-//! source code](https://github.com/iron/iron/blob/master/src/modifiers.rs).
+//! source code](https://github.com/iron/iron/blob/master/iron/src/modifiers.rs).
//!
//! For more information about the modifier system, see
//! [rust-modifier](https://github.com/reem/rust-modifier).
