Allows ref struct anti-constraint not shown

[Windows10CE]

Describe the issue or suggestion

The documentation does not have the new C#13 anti-constraint allows ref struct on any of the places it is used, like the Action/Func types, IEnumerable, IEquatable, and String.Create, and currently requires looking at the source or using an IDE to determine whether it is applied to a particular member.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[ViktorHofer]

cc @gewarren

[gewarren]

Thanks for the tag @ViktorHofer. This is tracked internally under https://dev.azure.com/ceapex/Engineering/_workitems/edit/996582.