fix doc

Author: seawinde

i18n/zh-CN/docusaurus-plugin-content-docs/current/query-acceleration/materialized-view/async-materialized-view/functions-and-demands.md

@@ -1030,6 +1030,7 @@ from (
 where o_orderkey > 2;
 ```
 
+另一个例子
 
 ```sql
 CREATE MATERIALIZED VIEW mv11_1