message: doc: improved examples for Padding with use of map_true
diff: @@ -178,7 +178,7 @@ impl<'a> Padding<'a> {
  ///
  /// let (hovered, hover_signal) = Mutable::new_and_signal(false);
  /// let button = Button::new()
  - /// .s(Padding::new().bottom_signal(hover_signal.map_bool(|| 20, || 0)))
  + /// .s(Padding::new().bottom_signal(hover_signal.map_true(|| 20)))
  /// .on_hovered_change(move |hover| hovered.set(hover))
  /// .label("Hover me");
  /// ```
  @@ -211,7 +211,7 @@ impl<'a> Padding<'a> {
  ///
  /// let (hovered, hover_signal) = Mutable::new_and_signal(false);
  /// let button = Button::new()
  - /// .s(Padding::new().left_signal(hover_signal.map_bool(|| 20, || 0)))
  + /// .s(Padding::new().left_signal(hover_signal.map_true(|| 20)))
  /// .on_hovered_change(move |hover| hovered.set(hover))
  /// .label("Hover me");
  /// ```
  