Write documentation for the new overlay API

graphics/src/lib.rs

@@ -2,7 +2,7 @@
 //! for [`iced`].
 //!
 //! [`iced`]: https://github.com/hecrj/iced
-//#![deny(missing_docs)]
+#![deny(missing_docs)]
 #![deny(missing_debug_implementations)]
 #![deny(unused_results)]
 #![deny(unsafe_code)]

graphics/src/overlay.rs

@@ -1 +1,2 @@
+//! Display interactive elements on top of other widgets.
 pub mod menu;

graphics/src/overlay/menu.rs

@@ -1,3 +1,4 @@
+//! Build and show dropdown menus.
 use crate::backend::{self, Backend};
 use crate::{Primitive, Renderer};
 use iced_native::{

graphics/src/widget/combo_box.rs

@@ -1,3 +1,4 @@
+//! Display a dropdown list of selectable values.
 use crate::backend::{self, Backend};
 use crate::{Primitive, Renderer};
 use iced_native::{