Fix type hint reference for xlib hook

src/platform/unix.rs

@@ -35,9 +35,11 @@ pub use crate::platform_impl::{x11::util::WindowType as XWindowType, XNotSupport
 #[cfg(feature = "wayland")]
 pub use crate::window::Theme;
 
-/// The first argument in the provided hook will be the pointer to XDisplay
-/// and the second one the pointer to XError. The return `bool` is an indicator
-/// whether error was handled by the callback.
+/// The first argument in the provided hook will be the pointer to `XDisplay`
+/// and the second one the pointer to [`XErrorEvent`]. The returned `bool` is an
+/// indicator whether the error was handled by the callback.
+///
+/// [`XErrorEvent`]: https://linux.die.net/man/3/xerrorevent
 #[cfg(feature = "x11")]
 pub type XlibErrorHook =
     Box<dyn Fn(*mut std::ffi::c_void, *mut std::ffi::c_void) -> bool + Send + Sync>;