code: def format_body(self, description, sys_info=None, traceback=None):
          
          body = BODY_ITEM_TEMPLATE % {
              'name': 'Description', 'value': description
          }
          if traceback:
              traceback = '\n'.join(traceback.splitlines()[-NB_LINES_MAX:])
              body += BODY_ITEM_TEMPLATE % {
                  'name': 'Traceback', 'value': '```\n%s\n```' % traceback
              }
          if sys_info:
              sys_info = '- %s' % '\n- '.join(sys_info.splitlines())
              body += BODY_ITEM_TEMPLATE % {
                  'name': 'System information', 'value': sys_info
              }
          return body
docs: Formats the body using markdown.
  
          :param description: Description of the issue, written by the user.
          :param sys_info: Optional system information string
          :param log: Optional application log
          :param traceback: Optional traceback.