Update migrate-cache-redis.md

Author: thakurmishra21

articles/reliability/migrate-cache-redis.md

@@ -16,8 +16,13 @@ This guide describes how to migrate your Azure Cache for Redis instance from non
 
 Azure Cache for Redis supports zone redundancy in its Premium, Enterprise, and Enterprise Flash tiers. A zone-redundant cache runs on VMs spread across multiple availability zone to provide high resilience and availability.  
 
+> [!NOTE]
+   > Converting an existing resource from non-availability zone support to availability zone support is in preview for standard & premium tier cache's.
+
 Currently, the only way to convert a resource from non-availability zone support to availability zone support is to redeploy your current cache.
 
+
+
  > [!NOTE]
    > Zone redundancy isn't supported with geo-replication.