Document .NET 11 CLI options

[Copilot]

Documents .NET 11 CLI additions missing from command references and clarifies NuGet subcommand help behavior.

• Project references

  • Add dotnet reference add --file syntax and guidance for file-based apps.

• Formatting

  • Add dotnet format --framework syntax and multi-targeting guidance.

• Tool execution

  • Add dotnet tool exec --yes syntax, confirmation behavior, and trust guidance.

• NuGet help

  • Clarify that dotnet nuget <subcommand> --help forwards to NuGet CLI help output.

dotnet reference add --file app.cs ../Library/Library.csproj
dotnet format --framework net11.0
dotnet tool exec --yes dotnetsay

• Fixes Document new CLI options #55891

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