Add missing ; in js-apis-display.md

Signed-off-by: Nmaojiangping <maojiangping@huawei.com>
Change-Id: I5742f3aa20b6c78c95d4327564db01d7ebd37c7e

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

@@ -256,7 +256,7 @@ Subscribes to display changes.
 
 ```js
 var callback = (data) => {
-    console.info('Listening enabled. Data: ' + JSON.stringify(data))
+    console.info('Listening enabled. Data: ' + JSON.stringify(data));
 }
 display.on("add", callback);
 ```

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

@@ -256,7 +256,7 @@ on(type: 'add'|'remove'|'change', callback: Callback<number>): void
 
 ```js
 var callback = (data) => {
-    console.info('Listening enabled. Data: ' + JSON.stringify(data))
+    console.info('Listening enabled. Data: ' + JSON.stringify(data));
 }
 display.on("add", callback);
 ```