Add link to MSBuild information about setting assembly-level attributes

[ghogen]

Summary

Reference updates in MSBuild 17.7 to support non-string parameters in the WriteCodeFragment task that can be used to set assembly-level attributes.

See comments in MSBuild issue 6285: https://github.com/dotnet/msbuild/pull/6285#issuecomment-2103104105

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Internal previews

📄 File	🔗 Preview link
docs/standard/assembly/set-attributes-project-file.md	Set assembly attributes in a project file