update zh-cn/application-dev/database/share-data-by-datashareextensionability.md.

Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/database/share-data-by-datashareextensionability.md

@@ -238,3 +238,9 @@
      console.info(`dsHelper delete result:${data}`);
    });
    ```
+
+## 相关实例
+
+针对数据共享开发，有以下相关实例可供参考：
+
+- [`CrossAppDataShare`：系统应用跨应用数据共享（ArkTS）（API9）](https://gitee.com/openharmony/applications_app_samples/tree/OpenHarmony-4.0-Beta1/code/SystemFeature/DataManagement/CrossAppDataShare)
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