message: doc: corrected grammar errors for padding documentation
diff: @@ -10,7 +10,7 @@ pub struct Padding<'a> {
  }
  impl<'a> Padding<'a> {
  - /// Set all padding, e.g top, right, bottom and left for an element.
  + /// Set all paddings, e.g top, right, bottom and left for an element.
  /// # Example
  /// ```no_run
  /// use zoon::*;
  @@ -21,7 +21,7 @@ impl<'a> Padding<'a> {
  Self::default().x(padding).y(padding)
  }
  - /// Set all padding, e.g top, right, bottom and left depending of signal's
  + /// Set all paddings, e.g top, right, bottom and left depending of signal's
  /// state.
  /// # Example
  /// ```no_run
  