message: fix comment error in cost estimator
diff: @@ -42,7 +42,7 @@ struct DeviceInfo {
  // Read bandwidth to intermediate memory in GB per second.
  double intermediate_read_gb_per_sec;
  - // Read bandwidth to intermediate memory in GB per second.
  + // Write bandwidth to intermediate memory in GB per second.
  double intermediate_write_gb_per_sec;
  DeviceInfo()
  