Use recently stabilized intra-doc links

See RFC: https://github.com/rust-lang/rfcs/blob/master/text/1946-intra-rustdoc-links.md

glow/src/settings.rs

@@ -1,9 +1,9 @@
 //! Configure a renderer.
 pub use iced_graphics::Antialiasing;
 
-/// The settings of a [`Renderer`].
+/// The settings of a [`Backend`].
 ///
-/// [`Renderer`]: ../struct.Renderer.html
+/// [`Backend`]: crate::Backend
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct Settings {
     /// The bytes of the font that will be used by default.