code: def relative_folder(self, module, folder):
          
          folder = self._relative_to_absolute(module, folder)
          return self.folder(folder)
docs: Load a folder located relative to a module and return the processed
          result.
  
          :param str module: can be
  
            - a path to a folder
            - a path to a file
            - a module name
  
          :param str folder: the path of a folder relative to :paramref:`module`
          :return: a list of the results of the processing
          :rtype: list
  
          Depending on :meth:`chooses_path` some paths may not be loaded.
          Every loaded path is processed and returned part of the returned list.
          You can use :meth:`choose_paths` to find out which paths are chosen to
          load.