Fixed ALT text typos

Author: Igor Pagliai

articles/virtual-wan/howto-firewall.md

@@ -31,53 +31,53 @@ To create a new virtual WAN and a new hub, use the steps in the following articl
 
 The **Overview** page for your virtual WAN shows a list of virtual hubs and secured hubs. The following figure shows a virtual WAN with no secured hubs.
 
-:::image type="content" source="./media/howto-firewall/vwan-overview1.jpg" alt-text="Screenshot shows the Overview page for a virtual WAN with a list of virtual hubs." lightbox="./media/howto-firewall/vwan-overview1.jpg":::
+:::image type="content" source="./media/howto-firewall/vwan-overview1.jpg" alt-text="Overview page for an Azure Virtual WAN" lightbox="./media/howto-firewall/vwan-overview1.jpg":::
 
 ## Convert to secured hub
 
 1. On the **Overview** page for your virtual WAN, select the hub that you want to convert to a secured hub. 
 
 2. Once in the hub properties, click on **Azure Firewall and Firewall Manager** under the "Security" section on the left:
 
-   :::image type="content" source="./media/howto-firewall/vwan-convert-firewall2.png" alt-text="Screenshot of vWAN hub properties." lightbox="./media/howto-firewall/vwan-convert-firewall2.png":::
+   :::image type="content" source="./media/howto-firewall/vwan-convert-firewall2.png" alt-text="Azure Virtual WAN Hub properties." lightbox="./media/howto-firewall/vwan-convert-firewall2.png":::
 
 3. Click on **Next: Azure Firewall** button at the bottom of screen: 
 
-   :::image type="content" source="./media/howto-firewall/vwan-select-hub3.png" alt-text="Screenshot of initial convertion flow." lightbox="./media/howto-firewall/vwan-select-hub3.png":::
+   :::image type="content" source="./media/howto-firewall/vwan-select-hub3.png" alt-text="[Select virtual hubs] step in the conversion flow" lightbox="./media/howto-firewall/vwan-select-hub3.png":::
 
 4. Select the Azure Firewall properties and status desired, then complete the wizard up to the **Review + confirm** tab:
 
-   :::image type="content" source="./media/howto-firewall/vwan-firewall-properties4.png" alt-text="Screenshot shows the Convert to secure hub pane with Confirm selected." lightbox="./media/howto-firewall/vwan-firewall-properties4.png":::
+   :::image type="content" source="./media/howto-firewall/vwan-firewall-properties4.png" alt-text="[Azure Firewall] step in the conversion flow" lightbox="./media/howto-firewall/vwan-firewall-properties4.png":::
 
 > [!NOTE]
 > As reported at the beginning of the article, the procedure described in this article will not permit the usage of Availability Zones for Azure Firewall. 
 
 5. After the hub has been converted to a secured hub, Azure Firewall status will be reported as in the image below: 
 
-   :::image type="content" source="./media/howto-firewall/vwan-firewall-secured5.png" alt-text="Screenshot of view secured hub." lightbox="./media/howto-firewall/vwan-firewall-secured5.png":::
+   :::image type="content" source="./media/howto-firewall/vwan-firewall-secured5.png" alt-text="End result of the conversion flow" lightbox="./media/howto-firewall/vwan-firewall-secured5.png":::
 
 ## View hub resources
 
 From the virtual WAN **Overview** page, select the secured hub. On the hub page, you can view all the virtual hub resources, including Azure Firewall.
 
 To view Azure Firewall settings from the secured hub, click on **Azure Firewall and Firewall Manager** under the "Security" section on the left:
 
-:::image type="content" source="./media/howto-firewall/vwan-secured-hub-properties6.png" alt-text="Screenshot of Secured virtual hub settings." lightbox="./media/howto-firewall/vwan-secured-hub-properties6.png":::
+:::image type="content" source="./media/howto-firewall/vwan-secured-hub-properties6.png" alt-text="Azure Virtual WAN status view in Azure Firewall Manager" lightbox="./media/howto-firewall/vwan-secured-hub-properties6.png":::
 
 Usage of Availability Zones for Azure Firewall in the Azure Virtual WAN Hub, can be checked accessing the security properties of the hub, as shown in the screenshot below:
 
-:::image type="content" source="./media/howto-firewall/vwan-firewall-hub-az-correct7.png" alt-text="Screenshot of Secured virtual hub availability zones" lightbox="./media/howto-firewall/vwan-firewall-hub-az-correct7.png":::
+:::image type="content" source="./media/howto-firewall/vwan-firewall-hub-az-correct7.png" alt-text="Availability Zones property in the Azure Firewall of Azure Virtual WAN secured hub" lightbox="./media/howto-firewall/vwan-firewall-hub-az-correct7.png":::
 
 
 ## Configure additional settings
 
 To configure additional Azure Firewall settings for the virtual hub, select the link to **Azure Firewall Manager**. For information about firewall policies, see [Azure Firewall Manager](../firewall-manager/secure-cloud-network.md#create-a-firewall-policy-and-secure-your-hub).
 
-:::image type="content" source="./media/howto-firewall/additional-settings.png" alt-text="Screenshot of Overview with Manage security provider route settings for this Secured virtual hub in Azure Firewall Manager selected." lightbox="./media/howto-firewall/additional-settings.png":::
+:::image type="content" source="./media/howto-firewall/additional-settings.png" alt-text="Secured hub overview with Manage Security Provider route settings in Azure Firewall Manager" lightbox="./media/howto-firewall/additional-settings.png":::
 
 To return to the hub **Overview** page, you can navigate back by clicking the path, as shown by the arrow in the following figure.
 
-:::image type="content" source="./media/howto-firewall/arrow.png" alt-text="Screenshot showing how to return to the overview page." lightbox="./media/howto-firewall/arrow.png":::
+:::image type="content" source="./media/howto-firewall/arrow.png" alt-text="How to return to the overview page." lightbox="./media/howto-firewall/arrow.png":::
 
 ## Upgrade to Azure Firewall Premium
 At any time, it is possible to upgrade from Azure Firewall Standard to Premium following these [instructions](../firewall/premium-migrate.md#migrate-a-secure-hub-firewall). This operation will require a maintenance windows since some minimal downtime will be generated.