Acrolinx/alt text fix

Author: JamesJBarnett

articles/application-gateway/tutorial-protect-application-gateway-ddos.md

@@ -168,7 +168,7 @@ Azure DDoS Network Protection is enabled at the virtual network where the resour
 
 5. In the pull-down box in DDoS protection plan, select **myDDoSProtectionPlan**.
 
-    :::image type="content" source="./media/tutorial-protect-application-gateway/enable-ddos-vnet.png" alt-text="Screenshot of ddos network protection.":::
+    :::image type="content" source="./media/tutorial-protect-application-gateway/enable-ddos-vnet.png" alt-text="Screenshot of D D o S network protection.":::
 
 6. Select **Save**.
 
@@ -276,4 +276,4 @@ To delete the resource group:
 Advance to the next article to learn how to:
 
 > [!div class="nextstepaction"]
-> [Configure an application gateway with TLS termination using the Azure portal](create-ssl-portal.md)
+> [Configure an application gateway with TLS termination using the Azure portal](create-ssl-portal.md)