message: Fixed outdated comment
diff: @@ -29,7 +29,7 @@ message RewriterConfig {
  bool optimize_tensor_layout = 1;
  // Fold constants (default is ON)
  Toggle constant_folding = 3;
  - // Arithmetic optimizations (default is OFF)
  + // Arithmetic optimizations (default is ON)
  Toggle arithmetic_optimization = 7;
  // If true, don't remove unnecessary ops from the graph
  bool disable_model_pruning = 2;
  