Remove AI note

release-notes/index.json

@@ -2,7 +2,6 @@
   "$schema": "https://raw.githubusercontent.com/dotnet/core/release-index/release-notes/schemas/v1/dotnet-release-version-index.json",
   "kind": "releases-index",
   "title": ".NET Release Index",
-  "ai_note": "Before navigating this graph, read the guide referenced by the \u0027llms-txt\u0027 relation; it explains optimal query patterns.",
   "latest": "10.0",
   "latest_lts": "10.0",
   "_links": {