Update .NET 10 NuGetAudit breaking change documentation

[Copilot]

This PR improves the existing breaking change documentation for the NuGetAuditMode default change in .NET 10 based on feedback from the issue.

Key improvements made:

Better title and structure

• Updated title from "dotnet restore audits transitive packages" to "NuGetAuditMode default changed when targeting .NET 10" for clarity
• Added proper metadata including ai-usage tag and issue reference
• Reorganized recommended actions into clear, actionable subsections

Enhanced content and guidance

• Added PrunePackageReference information: Explains how this .NET 10 feature helps reduce false positive audit warnings
• Improved recommended actions: Organized into three clear categories:
  • Address security vulnerabilities (with step-by-step guidance)
  • Suppress specific advisories (with proper warnings about implications)
  • Configure audit behavior (with clear options)
• Better tone: More informative and less prescriptive while still providing security guidance

Additional references and cross-links

• Added link to NuGetAudit 2.0 blog post with specific guidance section
• Referenced the PrunePackageReference feature documentation
• Added cross-reference to .NET 8 NuGetAudit introduction
• Added proper "Affected APIs" section per breaking change template

Navigation updates

• Updated table of contents and index entries to match the new, more descriptive title

Files changed:

• docs/core/compatibility/sdk/10.0/nugetaudit-transitive-packages.md - Enhanced breaking change content
• docs/core/compatibility/toc.yml - Updated TOC entry
• docs/core/compatibility/10.0.md - Updated index table entry

The documentation now provides developers with comprehensive, well-organized guidance for understanding and responding to this breaking change while maintaining an appropriate informative tone.

Fixes #47383.

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