message: Correct MorphableModel save_model documentation
diff: @@ -285,7 +285,7 @@ inline MorphableModel load_model(std::string filename)
  /**
  * Helper method to save a Morphable Model to the
  - * harddrive as cereal::BinaryInputArchive.
  + * harddrive as cereal::BinaryOutputArchive.
  *
  * @param[in] model The model to be saved.
  * @param[in] filename Filename for the model.
  