message: Correct comment.
diff: namespace voxblox_rviz_plugin {
  -// Visualizes a single grid_map_msgs::GridMap message.
  +// Visualizes a single voxblox_msgs::Mesh message.
  class VoxbloxMeshVisual {
  public:
  VoxbloxMeshVisual(Ogre::SceneManager* scene_manager,
  