update zh-cn/application-dev/database/database-preference-guidelines.md.

Signed-off-by: N @ge-yafang <geyafang@huawei.com>

update zh-cn/application-dev/database/database-preference-guidelines.md.
Signed-off-by: N @ge-yafang <geyafang@huawei.com>
3191ca9c · 葛亚芳 · Gitee · 38102843 · 3191ca9c
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        console.info("Deleted failed with err: " + err)
    })
   ```
+## 相关实例
+针对首选项开发，有以下相关实例可供参考：
+- [`Preferences`：首选项（eTS）（API9）](https://gitee.com/openharmony/app_samples/tree/master/data/Preferences)