[分布式硬件]api示例添加异常处理

Signed-off-by: N@shi-xiaoxiao-iris <shixiaoxiao2@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-device-manager.md

@@ -347,6 +347,7 @@ getLocalDeviceInfo(callback:AsyncCallback<DeviceInfo>): void
     this.dmInstance.getLocalDeviceInfo((err, data) => {
     if (err) {
       console.error("getLocalDeviceInfo errCode:" + err.code + ",errMessage:" + err.message);
+      return;
     }
       console.log('get local device info: ' + JSON.stringify(data));
     });
@@ -527,9 +528,9 @@ unPublishDeviceDiscovery(publishId: number): void
   ```js
   // 入参需要和publishDeviceDiscovery接口传入的publishId配对使用
   try {
-    dmInstance.publishDeviceDiscovery(publishInfo); // 当有发布结果时，通过回调通知给应用程序
+    dmInstance.unPublishDeviceDiscovery(publishId);
   } catch (err) {
-    console.error("publishDeviceDiscovery errCode:" + err.code + ",errMessage:" + err.message);
+    console.error("unPublishDeviceDiscovery errCode:" + err.code + ",errMessage:" + err.message);
   }
   ```