docs: def commit(self, comment="", delay_factor=1):
          """
          Commit the candidate configuration.
  
          Commit the entered configuration. Raise an error and return the failure
          if the commit fails.
  
          default:
             command_string = commit
          comment:
             command_string = commit comment <comment>
  
          """
          delay_factor = self.select_delay_factor(delay_factor)
          error_marker = "Failed to generate committed config"
          command_string = "commit"
  
          if comment:
              command_string += ' comment "{}"'.format(comment)
  
          output = self.config_mode()
          output += self.send_command_expect(
              command_string,
              strip_prompt=False,
              strip_command=False,
              delay_factor=delay_factor,
              expect_string=r"]",
          )
          output += self.exit_config_mode()
  
          if error_marker in output:
              raise ValueError(
                  "Commit failed with following errors:\n\n{}".format(output)
              )
          return output