docs: def save_config(self):
          """Save the config to the config file."""
          self.config_section['match_fuzzy'] = self.model_completer.match_fuzzy
          self.config_section['enable_vi_bindings'] = self.enable_vi_bindings
          self.config_section['show_completion_columns'] = \
              self.show_completion_columns
          self.config_section['show_help'] = self.show_help
          self.config_section['theme'] = self.theme
          self.config_obj.write()