update document

xxl-job-admin/src/main/resources/static/js/jobgroup.index.1.js

 		if (addressType == 0) {
             $addressList.css("background-color", "#eee");	// 自动注册
             $addressList.attr("readonly","readonly");
-			//$addressList.val("");
+			$addressList.val("");
 		} else {
             $addressList.css("background-color", "white");
 			$addressList.removeAttr("readonly");