Update cache-high-availability.md

Author: MSFTeegarden

articles/azure-cache-for-redis/cache-high-availability.md

@@ -132,10 +132,7 @@ Zone-redundant Enterprise and Enterprise Flash tier caches are available in the
 
 #### Availability zone redeployment and migration
 
-Currently, the only way to convert your cache from a non-AZ configuration to an AZ configuration is to redeploy the cache. To learn how to redeploy your current cache, see [Migrate an Azure Cache for Redis instance to availability zone support](/azure/reliability/migrate-cache-redis).
-
-> [!NOTE]
-   > Converting an existing resource from non-availability zone support to availability zone support is in Preview for Standard and Premium tier caches.
+In the Standard and Premium tiers, you can upgrade an existing resource to use zone redundancy. To learn how to upgrade your current cache, see [Migrate an Azure Cache for Redis instance to availability zone support](/azure/reliability/migrate-cache-redis).
 
 ## Persistence