message: Fix doc comments in `overlay`
diff: -//! Build and show dropdown menus.
  -///
  -/// This is an alias of an `iced_native` element with a default `Renderer`.
  +//! Display interactive elements on top of other widgets.
  pub mod menu {
  + //! Build and show dropdown menus.
  pub use iced_native::overlay::menu::{Appearance, State, StyleSheet};
  /// A widget that produces a message when clicked.
  