Issues to consider for 6.0 on Extensions:
- Nullable annotations: #43605
- API documentation debt on each of the areas: e.g #43871 and about 10 more similar.
- General documentation regarding extensions: Currently docs are spread between both dotnet/docs and dotnet/AspNetCore.Docs. Would be good to drive an effort to ensure the ASP.NET Core docs have been sufficiently refactored to focus on web-specific examples and reduce duplication with docs in dotnet/docs (representing the basis for all .NET workloads, not just web), while ensuring the ASP.NET Core docs also maintain their own set of web focused content for Extensions.