message: Update documentation for the multi_value feature
  Fixes
diff: @@ -141,15 +141,14 @@ impl Features {
  /// Configures whether the WebAssembly multi-value proposal will
  /// be enabled.
  ///
  - /// The [WebAssembly multi-value proposal][proposal] is not
  - /// currently fully standardized and is undergoing development.
  - /// Support for this feature can be enabled through this method for
  - /// appropriate WebAssembly modules.
  + /// The [WebAssembly multi-value proposal][proposal] is now fully
  + /// standardized and enabled by default, except with the singlepass
  + /// compiler which does not support it.
  ///
  /// This feature gates functions and blocks returning multiple values in a
  /// module, for example.
  ///
  - /// This is `false` by default.
  + /// This is `true` by default.
  ///
  /// [proposal]: https://github.com/webassembly/multi-value
  pub fn multi_value(&mut self, enable: bool) -> &mut Self {
  