message: Update comment and use expected_trt_output_rank in error message
diff: @@ -3845,7 +3845,8 @@ Status ConvertGather(OpConverterParams* params) {
  }
  // Both input are tensors, and the TF gather result will have rank:
  // (params.nbDims + 1) + (indices.nbDims + 1) - 1,
  - // where "+ 1" adds the batch dim.
  + // where "+ 1" adds the batch dim. If params is a weight, the TRT rank matches
  + // the TF rank so we don't have to add + 1.
  const int params_tf_rank =
  params_input.GetTrtDims().nbDims + (params_input.is_tensor() ? 1 : 0);
  const int indices_tf_rank = indices_input.GetTrtDims().nbDims + 1;
  @@ -3885,7 +3886,7 @@ Status ConvertGather(OpConverterParams* params) {
  if (trt_gather_output_dims.nbDims != expected_trt_output_rank) {
  return errors::Internal(
  "Get unexpected output dimensions of IGatherLayer. Expect nbDims: ",
  - tf_gather_output_rank - 2, ", actual nbDims: ",
  + expected_trt_output_rank, ", actual nbDims: ",
  trt_gather_output_dims.nbDims);
  }
  // Reshape the output so after adding the implicit batch dim it'll match the
  