message: doc(vm) Remove a useless part of the documentation.
diff: @@ -870,8 +870,7 @@ impl Drop for InstanceAllocator {
  /// `Self::deallocate_instance`.
  fn drop(&mut self) {
  // Because `fetch_sub` is already atomic, we do not need to
  - // synchronize with other threads unless we are going to
  - // delete the object.
  + // synchronize with other thread.
  if self.strong.fetch_sub(1, atomic::Ordering::Release) != 1 {
  return;
  }
  