Remove .NET 11 what’s new moniker checks

[jfversluis]

Summary

• Remove >=net-maui-11.0 moniker blocks from docs/whats-new/dotnet-11.md
• Update ms.date for the changed page

Motivation

The .NET 11 what's new article should render its content even when an older .NET MAUI docs view, such as net-maui-10.0, is selected.

Validation

• Confirmed no moniker blocks remain in docs/whats-new/dotnet-11.md
• Ran git diff --check

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Internal previews

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

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 5b8d5df:

✅ Validation status: passed

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

For more details, please refer to the build report.