docs: public void doDescription(StaplerRequest req, StaplerResponse rsp)
              throws IOException {
          if (req.getMethod().equals("GET")) {
              //read
              rsp.setContentType("text/plain;charset=UTF-8");
              rsp.getWriter().write(Util.fixNull(this.getDescription()));
              return;
          }
          if (req.getMethod().equals("POST")) {
              checkPermission(CONFIGURE);
  
              // submission
              if (req.getParameter("description") != null) {
                  this.setDescription(req.getParameter("description"));
                  rsp.sendError(SC_NO_CONTENT);
                  return;
              }
          }
  
          // huh?
          rsp.sendError(SC_BAD_REQUEST);
      }