Fix image alt text for accessibility requirement

Author: lynneoconnor

articles/active-directory/fundamentals/multi-tenant-common-solutions.md

@@ -94,7 +94,9 @@ Along with the current functionality, they want to offer the following.
 
 Company A provides SSO to on-premises apps for its own internal users using Azure Application Proxy as illustrated in the following diagram.
 
-![Example of application access](media/multi-tenant-common-solutions/app-access-scenario.png)
+:::image type="complex" source="media/multi-tenant-common-solutions/app-access-scenario.png" alt-text="Diagram illustrates example of application access.":::
+   Diagram title: Azure Application Proxy architecture solution. On the top left, a box labeled https: //sales.constoso.com contains a globe icon to represent a webiste. Below it, a group of icons represent the User and are connected by an arrow from the User to the website. On the top right, a cloud shape labeled Azure Active Directory contains an icon labeled Application Proxy Service. An arrow connects the website to the cloud shape. On the bottom right, a box labeled DMZ has the subtitle On-premises. An arrow connects the cloud shape to the DMZ box, splitting in two to point to icons labeled Connector. Below the Connector icon on the left, an arrow points down and splits in two to point to icons labeled App 1 and App 2. Below the Connector icon on the right, an arrow points down to an icon labeled App 3.
+:::image-end:::
 
 Admins in tenant A perform the following steps to enable their external users to access the same on-premises applications.