!7260 Modify test of XTS

Merge pull request !7260 from 史凯/master

en/application-dev/reference/apis/js-apis-util.md

@@ -1913,8 +1913,7 @@ Checks whether the input value is of the **native external** type.
 **Example**
   ```js
   var that = new util.types();
-  const data = util.createExternalType();
-  var result = that.isExternal(data);
+  var result = that.isExternal(true);
   ```
 
 

zh-cn/application-dev/reference/apis/js-apis-util.md

@@ -1910,8 +1910,7 @@ isExternal(value: Object): boolean
 **示例：**
   ```js
   var that = new util.types();
-  const data = util.createExternalType();
-  var result = that.isExternal(data);
+  var result = that.isExternal(true);
   ```