added missing redirect

Author: Marc Lichtman

.openpublishing.redirection.json

@@ -3077,6 +3077,11 @@
       "redirect_url": "https://azure.microsoft.com/en-us/updates?id=azure-orbital-ground-station-retirement",
       "redirect_document_id": false
     },
+    {
+      "source_path_from_root": "/articles/orbital/prepare-network.md",
+      "redirect_url": "https://azure.microsoft.com/en-us/updates?id=azure-orbital-ground-station-retirement",
+      "redirect_document_id": false
+    },
     {
       "source_path_from_root": "/articles/partner-twilio-cloud-services-dotnet-phone-call-web-role.md",
       "redirect_url": "https://www.twilio.com/docs/usage/tutorials/serverless-webhooks-azure-functions-and-csharp",