update for device Descriptors ,focus type and Sample format

Signed-off-by: Njiao_yanlin <jiaoyanlin@huawei.com>

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

@@ -3428,6 +3428,8 @@ audioRenderer.on('stateChange', (state) => {
 });
 ```
 
+### on('dataRequest') <sup>9+</sup>
+
 on(type: "dataRequest", callback: Callback<AudioRendererDataInfo>): void;
 
 订阅音频数据requeset事件回调。