Updated image file names and alt text for SEO improvements

Author: damabe

articles/app-service/app-service-web-get-started-java.md

@@ -115,7 +115,7 @@ mvn package azure-webapp:deploy
 
 Once deployment has completed, browse to the deployed application using the following URL in your web browser, for example `http://<webapp>.azurewebsites.net/`.
 
-![Sample app running in Azure](./media/app-service-web-get-started-java/java-hello-world-in-browser.png)
+![Sample app running in Azure App Service](./media/app-service-web-get-started-java/java-hello-world-in-browser-azure-app-service.png)
 
 **Congratulations!** You've deployed your first Java app to App Service on Windows.
 

articles/app-service/containers/quickstart-java.md

@@ -133,7 +133,7 @@ mvn package azure-webapp:deploy
 
 Once deployment has completed, browse to the deployed application using the following URL in your web browser, for example `http://<webapp>.azurewebsites.net`. 
 
-![Sample app running in Azure](media/quickstart-java/java-hello-world-in-browser.png)
+![Sample app running in Azure App Service](media/quickstart-java/java-hello-world-in-browser-azure-app-service.png)
 
 **Congratulations!** You've deployed your first Java app to App Service on Linux.