Update ms.topic value in docfx.json

Author: ghogen

msbuild-api-docs/docfx.json

@@ -44,7 +44,7 @@
       "apiPlatform": "dotnet",
       "breadcrumb_path": "~/breadcrumb/toc.yml",
       "ms.service": "visual-studio-windows",
-      "ms.topic": "managed-reference"
+      "ms.topic": "generated-reference"
     },
     "fileMetadata": {
       "author": {