Update _index.cn.md (#13781)
Update _index.cn.md (#13781)

* Update _index.cn.md

About shadow 'HINT' description

* Update _index.cn.md

代码格式化
apache/incubator-shardingsphere,apache/incubator-shardingsphere,apache/incubator-shardingsphere,apache/incubator-shardingsphere