Add VS for Mac updater server

Document the server from which VS for Mac pulls the list of available updates.

Author: slluis

docs/install/install-and-use-visual-studio-behind-a-firewall-or-proxy-server.md

@@ -137,7 +137,7 @@ To make sure that you have access to everything you want when you use Visual Stu
 | Xamarin Android App Publishing                                                                                                                                            | \*.googleapis.com <br/> play.google.com <br/>accounts.google.com                                                                                                                                                                                                                                                                                                                                                                                     | https/443                                                                                                                                                                                        | Used to interact with Google Play Store service to publish/upload Xamarin Android Applications directly from Visual Studio.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
 | Visual Studio Search Service                                                                                                                                              | data-ai.microsoft.com/search                                                                                                                                                                                                                                                                                                                                                                                                                         | https/443                                                                                                                                                                                        | Used to provide AI-enabled Visual Studio Search Service in `Ctrl+Q` search box                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
 | Azure Container Registry                                                                                                                                                  | *.azurecr.io                                                                                                                                                                                                                                                                                                                                                                                                                                         | https/443                                                                                                                                                                                        | Access container registries hosted on Azure, for configuration of CICD pipelines                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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+| Visual Studio for Mac Updater                                                                                                                                             | software.xamarin.com                                                                                                                                                                                                                                                                                                                                                                                                                                 | https/443                                                                                                                                                                                        | Used to get the list of available updates                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
 ## Troubleshoot network-related errors
 
 Sometimes, you might run in to network- or proxy-related errors when you install or use Visual Studio behind a firewall or a proxy server. For more information about solutions for such error messages, see the [Troubleshooting network-related errors when you install or use Visual Studio](troubleshooting-network-related-errors-in-visual-studio.md) page.