Update 0.FAQ.md (#2089) (#2092)

Co-authored-by: abby.huang <78209557+abby-cyber@users.noreply.github.com>

docs-2.0/20.appendix/0.FAQ.md

@@ -553,7 +553,7 @@ The following are the default ports used by NebulaGraph core and peripheral tool
 | 20 | NebulaGraph Dashboard | TCP | 8090 | Nebula HTTP Gateway dependency service port. Provides an HTTP interface for cluster services to interact with the NebulaGraph database using nGQL statements. |
 | 21 | NebulaGraph Dashboard | TCP | 9200 | Nebula Stats Exporter dependency service port. Collects cluster performance metrics, including service IP addresses, versions, and monitoring metrics (such as query count, query latency, heartbeat latency, etc.). |
 | 22 | NebulaGraph Dashboard | TCP | 9100 | Node Exporter dependency service port. Collects resource information for machines in the cluster, including CPU, memory, load, disk, and traffic. |
-| 23 | NebulaGraph Dashboard | TCP | 9090 | Prometheus service port. Time-series database for storing monitoring data. |
+| 23 | NebulaGraph Dashboard | TCP | 9091 | Prometheus service port. Time-series database for storing monitoring data. |
 | 24 | NebulaGraph Dashboard | TCP | 7003 | Dashboard Community Edition web service port. |
 | 25 | NebulaGraph Dashboard | TCP | 7005 | Dashboard Enterprise Edition web service port. |
 | 26 | NebulaGraph Dashboard | TCP | 9093 | Alertmanager service port. Receives alerts from Prometheus and sends alert notifications to Dashboard. |