Enable XML documentation

[ob-stripe]

r? @remi-stripe
cc @stripe/api-libraries

Generates the XML documentation file. Even though few of our classes are properly documented, it's better than nothing.

Partially fixes #1261.

[remi-stripe]

How did you test/confirm this change will do what you expect? also added some minor comments

[ob-stripe]

How did you test/confirm this change will do what you expect?

I verified that building the project generates a Stripe.net.xml file with the documentation. I assume that the file will automatically be included next time we push a version to NuGet, but that's unfortunately hard to test in advance.

[remi-stripe]

Gotcha, I think that makes sense, approving!

[ob-stripe]

Released in 19.6.0.

[xt0rted]

Confirming this is showing in the NuGet package now.

19.5.0

19.6.0

[xt0rted]

I assume that the file will automatically be included next time we push a version to NuGet, but that's unfortunately hard to test in advance.

You can open the NuGet package from the CI build with NuGet Package Explorer if you ever need to test things like that.

[ob-stripe]

\o/ Awesome, thanks @xt0rted!