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Add period at end of alt text.

Author: AnnaMHuff

articles/ai-services/openai/encrypt-data-at-rest.md

@@ -70,7 +70,7 @@ To enable customer-managed keys in the Azure portal, follow these steps:
 1. Under **Encryption type**, select **Customer Managed Keys**, as shown in the following screenshot.
 
    > [!div class="mx-imgBorder"]
-   > ![Screenshot of create a resource user experience](./media/encryption/encryption.png)
+   > ![Screenshot of create a resource user experience.](./media/encryption/encryption.png)
 
 ### Specify a key