Enhance Azure Key Vault key management guidance

Updated the Azure Key Vault recommendation to include support for automatic key rotation policies.

Author: staleycyn

learn-pr/wwl-azure/configure-storage-security/includes/5-determine-storage-service-encryption.md

@@ -2,7 +2,7 @@ Azure Storage encryption for data at rest protects your data by ensuring your or
 
 When you create a storage account, Azure generates two 512-bit storage account access keys for that account. These keys can be used to authorize access to data in your storage account via Shared Key authorization, or via SAS tokens that are signed with the shared key.
 
-Microsoft recommends that you use Azure Key Vault to manage your access keys, and that you regularly rotate and regenerate your keys. Using Azure Key Vault makes it easy to rotate your keys without interruption to your applications. You can also manually rotate your keys.
+Microsoft recommends that you use Azure Key Vault to manage your access keys, and that you regularly rotate and regenerate your keys. Azure Key Vault supports automatic key rotation policies, allowing you to define rotation schedules (e.g., every 90 days) that rotate keys automatically. You can also manually rotate your keys when needed.
 
 ### Things to know about Azure Storage encryption