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

removed outdated reference to incredibuild CDN

Author: PoulChapman

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

@@ -68,7 +68,6 @@ The Visual Studio Installer downloads files from various domains and their downl
 | dl.google.com                     | Mobile development with JavaScript (Android SDK and NDK, Emulator) <br /><br />Mobile Development with .NET (Android SDK and NDK, Emulator) |
 | ib-downloads-official.s3.amazonaws.com | Game development with C++ (IncrediBuild)                                                                                               |
 | www\.incredibuild.com             | Game development with C++ (IncrediBuild)                                                                                                    |
-| incredibuildvs2017i.azureedge.net | Game development with C++ (IncrediBuild)                                                                                                    |
 | www\.python.org                   | Python development (Python) <br /><br />Data science and analytical applications (Python)                                                   |
 | developerservices2.apple.com      | Xamarin.iOS provisioning                                                                                                                    |
 | developer.apple.com               | Xamarin.iOS provisioning                                                                                                                    |