message: [XLA:TPU] Fix error message to avoid messages such as:
  Requested device count (2) exceeds the number of available devices on the target (2)
diff: @@ -746,9 +746,9 @@ Status Service::GetDeviceHandles(const GetDeviceHandlesRequest* arg,
  }
  if (available_device_count < arg->device_count() * replica_count) {
  return ResourceExhausted(
  - "Requested device count (%d) exceeds the number of available devices "
  - "on the target (%d)",
  - arg->device_count(), available_device_count);
  + "Requested logical device count (%d) with replica count (%d) exceeds "
  + "the number of available physical devices on the target (%d)",
  + arg->device_count(), replica_count, available_device_count);
  }
  for (int64 i = 0; i < arg->device_count(); ++i) {
  