Add recommendation for migrations to TxOptimized.

Author: wmgries

includes/storage-files-tiers-overview.md

@@ -14,7 +14,7 @@ Azure Files offers two different media tiers of storage, SSD and HDD, which allo
 - **SSD (Premium)**: Premium file shares use by solid-state drives (SSDs) and provide consistent high performance and low latency, within single-digit milliseconds for most IO operations, for IO-intensive workloads. Premium file shares are suitable for a wide variety of workloads like databases, web site hosting, and development environments. Premium file shares can be used with both Server Message Block (SMB) and Network File System (NFS) protocols. Premium file shares are deployed in the **FileStorage storage account** kind and are only available in a provisioned billing model. For more information on the provisioned billing model for premium file shares, see [Understanding provisioning for premium file shares](../articles/storage/files/understanding-billing.md#provisioned-model). Premium file shares offer [99.99% availability](https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services) (see "Azure Files Premium Tier").
 
 - **HDD (Standard)**: Standard file shares use hard disk drives (HDDs) and provide a cost-effective storage option for general purpose file shares. Standard file shares are deployed in the **general purpose version 2 (GPv2) storage account** kind. Standard file shares offer [99.9% availability](https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services) (see "Storage Accounts"). Standard file shares use a pay-as-you-go model that provides usage-based pricing. The *access tier* of a file share enables you to adjust the storage costs against IOPS cost to optimized your total bill:
-    - **Transaction optimized** file shares offer the lowest cost transaction pricing for transaction heavy workloads that don't need the low latency offered by premium file shares.
+    - **Transaction optimized** file shares offer the lowest cost transaction pricing for transaction heavy workloads that don't need the low latency offered by premium file shares. Recommended while migrating data to Azure Files.
     - **Hot** file shares offer balanced storage and transaction pricing for workloads that have a good measure of both.
     - **Cool** file shares offer the most cost-efficient storage pricing for storage-intensive workloads.