Fix majority of unresolved documentation links

runtime/src/overlay/nested.rs

@@ -6,7 +6,7 @@ use crate::core::renderer;
 use crate::core::widget;
 use crate::core::{Clipboard, Event, Layout, Point, Rectangle, Shell, Size};
 
-/// An [`Overlay`] container that displays nested overlays
+/// An overlay container that displays nested overlays
 #[allow(missing_debug_implementations)]
 pub struct Nested<'a, Message, Renderer> {
     overlay: overlay::Element<'a, Message, Renderer>,
@@ -27,6 +27,8 @@ where
     }
 
     /// Returns the layout [`Node`] of the [`Nested`] overlay.
+    ///
+    /// [`Node`]: layout::Node
     pub fn layout(
         &mut self,
         renderer: &Renderer,