message: docs(body): hide private __hyper_full_data method from docs
diff: @@ -114,6 +114,11 @@ impl<E: Payload> Payload for Box<E> {
  fn content_length(&self) -> Option<u64> {
  (**self).content_length()
  }
  +
  + #[doc(hidden)]
  + fn __hyper_full_data(&mut self, arg: FullDataArg) -> FullDataRet<Self::Data> {
  + (**self).__hyper_full_data(arg)
  + }
  }
  @@ -358,6 +363,7 @@ impl Payload for Body {
  }
  // We can improve the performance of `Body` when we know it is a Once kind.
  + #[doc(hidden)]
  fn __hyper_full_data(&mut self, _: FullDataArg) -> FullDataRet<Self::Data> {
  match self.kind {
  Kind::Once(ref mut val) => FullDataRet(val.take()),
  