message: Mention generic range in `Slider` documentation
diff: @@ -16,7 +16,8 @@ use std::{hash::Hash, ops::RangeInclusive};
  ///
  /// A [`Slider`] will try to fill the horizontal space of its container.
  ///
  -/// The step size defaults to 1.0.
  +/// The [`Slider`] range of numeric values is generic and its step size defaults
  +/// to 1 unit.
  ///
  /// [`Slider`]: struct.Slider.html
  ///
  