message: fix missing semicolon in doc test
diff: @@ -20,7 +20,7 @@ use crate::{
  ///
  /// let is_active = true;
  ///
  -/// Toggler::new(is_active, "Toggle me!", |b| Message::TogglerToggled(b))
  +/// Toggler::new(is_active, "Toggle me!", |b| Message::TogglerToggled(b));
  /// ```
  ///
  #[allow(missing_debug_implementations)]
  