Update overview.md

Updated Brazil South Zone Redundancy

Author: kabharati

articles/postgresql/flexible-server/overview.md

@@ -84,7 +84,7 @@ One advantage of running your workload in Azure is global reach. The flexible se
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 | Australia East | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
 | Australia Southeast | :heavy_check_mark: | :x: | :heavy_check_mark: | :heavy_check_mark: |
-| Brazil South | :heavy_check_mark: (v3 only) | :heavy_check_mark: | :heavy_check_mark: | :x: |
+| Brazil South | :heavy_check_mark: (v3 only) | :x: $ | :heavy_check_mark: | :x: |
 | Canada Central | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | 
 | Canada East | :heavy_check_mark: | :x: | :heavy_check_mark: | :heavy_check_mark: |
 | Central India | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |