update zh-cn/device-dev/subsystems/subsys-usbservice-guide.md.

Signed-off-by: Nduangavin123 <duanxichao@huawei.com>
Signed-off-by: Nduangavin123 <duanxichao@huawei.com>

zh-cn/device-dev/subsystems/subsys-usbservice-guide.md

@@ -34,8 +34,7 @@
 5. 配置设备接口
 
    ```cpp
-   ret = g_usbClient.ClaimInterface(pip, interface, true);
-   interface为deviceList中device的interface。
+   ret = g_usbClient.ClaimInterface(pip, interface, true); //interface为deviceList中device的interface。
    ```
 
 6. 数据传输