message: Add comment for sorted=False in TopK converter
diff: @@ -5084,6 +5084,10 @@ Status ConvertTopK(OpConverterParams* params) {
  TFAttrs attrs(node_def);
  const bool sorted = attrs.get<bool>("sorted");
  if (!sorted) {
  + // TensorRT only supports sorted output. Although TensorFlow API
  + // doesn't specify the order of output elements in case sorted=false,
  + // but it's safer to not convert because the output of TensorRT might
  + // be different with TensorFlow which can cause confusion.
  return errors::InvalidArgument("Only sorted=True is supported, at",
  node_def.name());
  }
  