Aspnetcore.docs: "Advanced" Section for HttpClientFactory Docs

[stevejgordon]

There is a recent discussion on an issue in the HttpClientFactory repo where @reisenberger highlighted a good use case for one of the less common overloads of the HttpClientBuilder.AddPolicyHandler method.

Would it be reasonable to consider adding a subpage under the existing documentation which provides some real-world demonstration of when and how one might use some of these overloads and more advanced possibilities? Similar to the plans for the Dependency Injection section.

cc @glennc, @scottaddie and @rynowak

[rynowak]

It sounds good to me. I'd think of it more like a recipes section. Basically we get a lot of questions about how DI interacts with the factory and handlers. It would be nice to document some of the things that work well as people are having trouble figuring it out