Address the comments

Author: jerryshao

docs/index.md

@@ -71,13 +71,13 @@ Gravitino currently supports the following catalogs:
 * [**MySQL catalog**](./jdbc-mysql-catalog.md)
 * [**PostgreSQL catalog**](./jdbc-postgresql-catalog.md)
 
-Gravitino also provides an Iceberg REST catalog service for the Iceberg table format. See the
-[Iceberg REST catalog service](./iceberg-rest-service.md) for details.
-
 **Fileset catalogs:**
 
 * [**Hadoop catalog**](./hadoop-catalog.md)
 
+Gravitino also provides an Iceberg REST catalog service for the Iceberg table format. See the
+[Iceberg REST catalog service](./iceberg-rest-service.md) for details.
+
 ## Gravitino playground
 
 To experience Gravitino with other components easily, Gravitino provides a playground to run. It

docs/manage-fileset-metadata-using-gravitino.md

@@ -22,7 +22,7 @@ Fileset's identifier, without needing to know the physical path of the managed d
 unified access control mechanism, filesets can also be managed via the same role based access
 control mechanism without needing to set access controls to different storages.
 
-To use fileset, we assume that:
+To use fileset, please make sure that:
 
  - Gravitino server is launched, and the host and port is [http://localhost:8090](http://localhost:8090).
  - Metalake has been created.