[PDF] Pre-release alert in PDF download (net9 version)

[hakenr]

The PDF file with ASP.NET Core 9.0 documentation (the "complete" one with 7000+ pages) includes pre-release alert at the start of almost every chapter:

These alerts should probably be removed now that .NET 9 has been officially released.

cc @guardrex

[guardrex]

@Rick-Anderson @tdykstra @wadepickett

@hakenr ... They've already made the version selector update. There's something funky going on with the PDF generation engine. This will probably become an internal docs engineering team issue. One of the other guys will probably open it internally and close this issue. Thanks for calling it out.

[Rick-Anderson]

Give it a few weeks.

[guardrex]

Closing now ... this seems to have resolved on its own ✨.