Alt text fix

Author: v-dirichards

articles/active-directory/develop/includes/web-app/quickstart-python.md

@@ -18,7 +18,7 @@ In this quickstart, you download and run a code sample that demonstrates how a P
 
 The following diagram displays how the sample app works:
 
-![Shows how the sample app generated by this quickstart works](../../media/quickstart-v2-python-webapp/topology.png)
+![Diagram that shows how the sample app generated by this quickstart works.](../../media/quickstart-v2-python-webapp/topology.png)
 
 1. The application uses the [`identity` package](https://pypi.org/project/identity/) to obtain an access token from the Microsoft Identity platform.
 2. The access token is used as a bearer token to authenticate the user when calling the Microsoft Graph API.