Update docfx.json

Author: localden

dotnet/docfx.json

@@ -43,7 +43,7 @@
     ],
     "globalMetadata": {
       "uhfHeaderId": "MSDocsHeader-Entra",
-      "feedback_system": "GitHub",
+      "feedback_system": "Standard",
       "feedback_github_repo": "MicrosoftDocs/microsoft-authentication-library-dotnet",
       "feedback_product_url": "https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues",
       "apiPlatform": "dotnet",