Add information about changes to Win11 and 3.5

[adegeo]

Summary

Future releases of Windows 11 (actually it started in a previous insiders build) are removing .NET Framework 3.5 from the Operating System. A standalone installer for Windows 11 is provided.

Once this change is applied to the non-insiders release, these articles will include download and installation instructions.

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Internal previews

📄 File	🔗 Preview link
docs/framework/install/dotnet-35-windows-11-faq.yml	.NET Framework 3.5 on Windows 11 FAQ
docs/framework/install/dotnet-35-windows-11.md	Install .NET Framework 3.5 on Windows 11
docs/framework/install/dotnet-35-windows.md	docs/framework/install/dotnet-35-windows
docs/framework/install/guide-for-developers.md	Install .NET Framework for developers
docs/framework/install/on-windows-and-server.md	Install .NET Framework on Windows
docs/framework/toc.yml	docs/framework/toc

[Copilot]

Pull request overview

Add documentation updates for the Windows 11 change where .NET Framework 3.5 is removed as a Windows optional component (in Insider builds), and introduce guidance and FAQ content for the standalone installer path.

Changes:

• Add new Windows 11-specific install article and a dedicated FAQ for .NET Framework 3.5.
• Update existing .NET Framework 3.5 install guidance to reference Windows 11 Insider build behavior and installer-based flow.
• Update the .NET Framework TOC to surface the new Windows 11 content.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
docs/framework/toc.yml	Splits the .NET Framework 3.5 nav entry into Windows 11, FAQ, and “other Windows,” and tweaks a migration TOC label.
docs/framework/install/on-windows-and-server.md	Adds an include callout noting the Windows 11 Insider change for .NET Framework 3.5 acquisition.
docs/framework/install/dotnet-35-windows.md	Adds guidance callouts and references to the Windows 11 installer/FAQ, and expands developer-facing notes.
docs/framework/install/dotnet-35-windows-11.md	New Windows 11-specific article covering version detection and the Insider-build installer approach.
docs/framework/install/dotnet-35-windows-11-faq.yml	New FAQ covering availability, deployment constraints, migration guidance, and troubleshooting.
docs/framework/install/guide-for-developers.md	Updates ms.date.
docs/framework/install/includes/dotnet-35-installer.md	New include describing the standalone installer availability for Windows 11 Insider builds.
docs/framework/install/includes/dotnet-35-find-update.md	New include encouraging readers to find updated software before installing .NET Framework 3.5.
docs/framework/install/includes/dotnet-35-windows-11-caution-version.md	New include cautioning Windows 11 Insider users to follow the Windows 11-specific guidance.

[Copilot]

The link to the FAQ uses ../dotnet-35-windows-11-faq.yml, but the FAQ file is in the same directory as this article. This relative path likely breaks the link. Update it to point to the correct relative location.

Suggested change

	For more information about this change to .NET Framework 3.5, see [.NET Framework 3.5 on Windows 11 FAQ](../dotnet-35-windows-11-faq.yml).
	For more information about this change to .NET Framework 3.5, see [.NET Framework 3.5 on Windows 11 FAQ](dotnet-35-windows-11-faq.yml).