Fixing acronym capitalization in alt text

Author: v-dirichards

articles/iot-edge/how-to-install-iot-edge-ubuntuvm-bicep.md

@@ -147,7 +147,7 @@ You can't deploy a remote Bicep file. Save a copy of the [Bicep file](https://ra
     The **DNS Name** can also be obtained from the **Overview** section of the newly deployed virtual machine within the Azure portal.
 
     > [!div class="mx-imgBorder"]
-    > [![Screenshot showing the dns name of the iotedge vm](./media/how-to-install-iot-edge-ubuntuvm/iotedge-vm-dns-name.png)](./media/how-to-install-iot-edge-ubuntuvm/iotedge-vm-dns-name.png)
+    > [![Screenshot showing the DNS name of the IoT Edge Virtual Machine.](./media/how-to-install-iot-edge-ubuntuvm/iotedge-vm-dns-name.png)](./media/how-to-install-iot-edge-ubuntuvm/iotedge-vm-dns-name.png)
 
 1. If you want to SSH into this VM after setup, use the associated **DNS Name** with the command:
     `ssh <adminUsername>@<DNS_Name>`