update zh-cn/device-dev/subsystems/subsys-multimedia-camera-preview-guide.md.

Signed-off-by: yujian <dy12345678900812@163.com >
Signed-off-by: N相遇 <dy12345678900812@163.com>

zh-cn/device-dev/subsystems/subsys-multimedia-camera-preview-guide.md

@@ -36,6 +36,6 @@
 3. 开始和结束预览。
      
    ```
-   stateCallback->camera_->TriggerLoopingCapture(*fc); // start previewing
-   stateCallback->camera_->StopLoopingCapture(); // stop previewing
+   stateCallback->camera_->TriggerLoopingCapture(*fc); // 开始预览
+   stateCallback->camera_->StopLoopingCapture(); // 停止预览
    ```