redis cache document with Zonre redundnant (#536)

* testing

* update redis

* update redis cache with ZR

* removed spaces

Author: SalimKainos

source/cloud-native-platform/new-component/Update-redis-with-zone-redundant.html.md.erb renamed to source/cloud-native-platform/guides/update-redis-with-zone-redundant.html.md.erb

@@ -38,6 +38,13 @@ Running `terraform apply` will create the Storage Account needed for backup func
 
 > **Note:** The Storage Account is required for the RDB backup feature enabled with `rdb_backup_enabled = true` in your Terraform configuration.
 
+## Important Environment and Cost Considerations
 
+> **Note:** Zone redundancy should only be enabled for production environments to avoid higher costs in lower environments. This process is intended only for the following production subscriptions:
+>
+> - DCD-CNP-Prod
+> - DTS-SHAREDSERVICES-PROD
+
+Please ensure you are applying these changes only in the specified production subscriptions.