Android API 23 minimum platform version for .NET 11

[Copilot]

Summary

Updates the .NET MAUI docs to reflect the minimum Android platform version being raised from API 21 (Lollipop) to API 23 (Marshmallow) starting in .NET 11 Preview 3.

Changes

docs/supported-platforms.md

• Split the >=net-maui-9.0 moniker range into >=net-maui-9.0 <=net-maui-10.0 (retaining API 21) and a new >=net-maui-11.0 section showing Android 6.0 (API 23) as the minimum.
• Updated ms.date.

docs/whats-new/dotnet-11.md

• Added Preview 3 to the release notes link list.
• Added a "Minimum supported Android API" section under ".NET for Android" documenting the API 21 → 23 bump with migration guidance for $(SupportedOSPlatformVersion).
• Fixed a pre-existing typo ("in .NET 10" → "in .NET 11").
• Updated ms.date.

docs/whats-new/toc.yml

• Added .NET 11 entry to the product releases table of contents.

Platform notes

• This change affects Android only. iOS, Mac Catalyst, and Windows minimum versions are unchanged.
• Blazor apps continue to require API 24 (unchanged).

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Internal previews

📄 File	🔗 Preview link
docs/supported-platforms.md	docs/supported-platforms
docs/whats-new/dotnet-11.md	docs/whats-new/dotnet-11

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit ba2243d:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/supported-platforms.md	✅Succeeded	View (>=net-maui-8.0)
docs/whats-new/dotnet-11.md	✅Succeeded	View (>=net-maui-8.0)
docs/whats-new/toc.yml	✅Succeeded	View (>=net-maui-8.0)

For more details, please refer to the build report.

[simonrozsival]

I need to double check, but I'm 90% sure we need API 24 for CoreCLR.

[PureWeen]

Requesting changes while we wait for #3239 (comment)