Address comments

Signed-off-by: Yanjun Zhou <zhouya@vmware.com>

docs/network-flow-visibility.md

@@ -213,14 +213,15 @@ Flow Aggregator Helm Chart values.
 
 Please refer to the Flow Aggregator Helm Chart [README](../build/charts/flow-aggregator/README.md)
 and [Flow Aggregator Configuration](https://github.com/antrea-io/antrea/blob/main/docs/network-flow-visibility.md#configuration-1)
-to learn about more ClickHouse configuration options in Flow Aggregator.
+to learn more about ClickHouse configuration options in Flow Aggregator.
 
 ##### ClickHouse Cluster
 
 From Theia v0.2.0, we support deploying a ClickHouse cluster with data replication.
-A ClickHouse cluster consists of shards. Shards refer to the servers that contain
-different parts of the data, which provide a horizontal cluster scaling strategy.
-Each shard consists of one or more replica hosts to ensure reliability.
+A ClickHouse cluster consists of one or more shards. Shards refer to the servers
+that contain different parts of the data. You can deploy multiple shards to scale
+the cluster horizontally. Each shard consists of one or more replica hosts. You
+can deploy multiple replicas in a shard to ensure reliability.
 
 To deploy ClickHouse as a cluster, please set `clickhouse.cluster.enable` to true
 and set `clickhouse.cluster.shards` and `clickhouse.cluster.replicas` per your