message: updated a doc comment
diff: @@ -59,9 +59,9 @@ pub struct Canvas {
  debug_id: DebugId,
  }
  -/// A generic non-multi-sampled canvas that cannot contain another canvas. This type should
  -/// never need to be used directly; use [`graphics::Canvas`](type.Canvas.html)
  -/// instead.
  +/// A non-multi-sampled canvas that cannot contain another canvas.
  +///
  +/// Used by `Canvas` to store the multi-sampled texture.
  #[derive(Debug)]
  struct MultiSampledCanvas {
  target: RawRenderTargetView<gfx_device_gl::Resources>,
  