AuthenticationSchemeOptions.ForwardSignOut comment example is incorrect

[serpent5]

The summary comment for AuthenticationSchemeOptions.ForwardSignOut states:

For example Context.SignOutAsync("ThisScheme") => Context.SignInAsync("ForwardSignOutValue");

It should be SignOutAsync instead of SignInAsync.

This error is also present in the docs, which I've rasied an issue for at dotnet/AspNetCore.Docs#13198.

[blowdart]

Would you like to open a PR for this?

[serpent5]

Sure - I'm just doing a PR for the docs issue so I'll do this straight after. Starting small... 😃

[blowdart]

@HaoK can you look at the PR when it pops up and merge as appropriate? :)