improve docs

Author: wuchong

website/docs/maintenance/filesystems/hdfs.md

@@ -61,8 +61,8 @@ For most use cases, these work perfectly. However, you should configure your mac
 1. Your HDFS uses kerberos security
 2. You need to avoid version conflicts between Fluss's bundled hadoop libraries and your HDFS cluster
 
-Fluss automatically loads HDFS dependencies on the machine via the HADOOP_CLASSPATH environment variable.
-Make sure that the HADOOP_CLASSPATH environment variable is set up (it can be checked by running echo $HADOOP_CLASSPATH).
+Fluss automatically loads HDFS dependencies on the machine via the `HADOOP_CLASSPATH` environment variable.
+Make sure that the `HADOOP_CLASSPATH` environment variable is set up (it can be checked by running `echo $HADOOP_CLASSPATH`).
 If not, set it up using
 ```bash
 export HADOOP_CLASSPATH=`hadoop classpath`

website/docs/maintenance/tiered-storage/lakehouse-storage.md

@@ -49,17 +49,9 @@ datalake.paimon.warehouse: hdfs:///path/to/warehouse
 While Fluss includes the core Paimon library, additional jars may still need to be manually added to `${FLUSS_HOME}/plugins/paimon/` according to your needs.
 For example:
 - If you are using Paimon filesystem catalog with OSS filesystem, you need to put `paimon-oss-<paimon_version>.jar` into directory `${FLUSS_HOME}/plugins/paimon/`.
-- If you are using Hive catalog, you need to put [the flink sql hive connector jar](https://nightlies.apache.org/flink/flink-docs-stable/docs/connectors/table/hive/overview/#using-bundled-hive-jar) into directory `${FLUSS_HOME}/plugins/paimon/`.
+- If you are using Paimon Hive catalog, you need to put [the flink sql hive connector jar](https://nightlies.apache.org/flink/flink-docs-stable/docs/connectors/table/hive/overview/#using-bundled-hive-jar) into directory `${FLUSS_HOME}/plugins/paimon/`.
 
-#### Hadoop Environment Configuration(required for kerberos-secured HDFS)
-Other usage scenarios can skip this section.
-
-Fluss automatically loads HDFS dependencies on the machine via the HADOOP_CLASSPATH environment variable.
-Make sure that the HADOOP_CLASSPATH environment variable is set up (it can be checked by running echo $HADOOP_CLASSPATH).
-If not, set it up using
-```bash
-export HADOOP_CLASSPATH=`hadoop classpath`
-```
+Additionally, when using Paimon with HDFS, you must also configure the Fluss server with the Hadoop environment. See the [HDFS setup guide](/docs/maintenance/filesystems/hdfs.md) for detailed instructions.
 
 ### Start The Datalake Tiering Service
 Then, you must start the datalake tiering service to tier Fluss's data to the lakehouse storage.