docs: (IAC-703) Update server_version notes (#262)

Author: riragh

docs/CONFIG-VARS.md

@@ -332,7 +332,7 @@ Each server element, like `foo = {}`, can contain none, some, or all of the para
 | geo_redundant_backup_enabled | Enable Geo-redundant or not for server backup | bool | false | Not supported for the basic tier. |
 | administrator_login | The Administrator Login for the PostgreSQL Flexible Server. Changing this forces a new resource to be created. | string | "pgadmin" | The admin login name cannot be azure_superuser, azure_pg_admin, admin, administrator, root, guest, or public. It cannot start with pg_. See: [Microsoft Quickstart Server Database](https://docs.microsoft.com/en-us/azure/postgresql/flexible-server/quickstart-create-server-portal) |
 | administrator_password | The Password associated with the administrator_login for the PostgreSQL Flexible Server | string | "my$up3rS3cretPassw0rd" | The password must contain between 8 and 128 characters and must contain characters from three of the following categories: English uppercase letters, English lowercase letters, numbers (0 through 9), and non-alphanumeric characters (!, $, #, %, etc.). |
-| server_version | The version of the Azure Database for PostgreSQL Flexible server instance. Changing this forces a new resource to be created.| string | "13" | |
+| server_version | The version of the PostgreSQL Flexible server instance | string | "13" | Refer to the [Viya 4 Administration Guide](https://go.documentation.sas.com/doc/en/sasadmincdc/default/itopssr/p05lfgkwib3zxbn1t6nyihexp12n.htm?fromDefault=#p1wq8ouke3c6ixn1la636df9oa1u) for the supported versions of PostgreSQL for SAS Viya. |
 | ssl_enforcement_enabled | Enforce SSL on connection to the Azure Database for PostgreSQL Flexible server instance | bool | true | |
 | postgresql_configurations | Sets a PostgreSQL Configuration value on a Azure PostgreSQL Flexible Server | list(object) | [] | More details can be found [here](https://docs.microsoft.com/en-us/azure/postgresql/flexible-server/howto-configure-server-parameters-using-cli) |