Update overview.md

Added preview tag from overview table

Author: kabharati

articles/postgresql/flexible-server/overview.md

@@ -91,7 +91,7 @@ The flexible server comes with a [built-in PgBouncer](concepts-pgbouncer.md), a
 
 One advantage of running your workload in Azure is global reach. The flexible server is currently available in the following Azure regions:
 
-| Region | V3/V4 compute availability | Zone-redundant HA | Geo-Redundant backup (Preview) |
+| Region | V3/V4 compute availability | Zone-redundant HA | Geo-Redundant backup |
 | --- | --- | --- | --- |
 | Australia East | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
 | Australia Southeast | :heavy_check_mark: | :x: | :heavy_check_mark: |