Nullable is in different places for ref and value types

I searched on nullable C#, ended in in the nullable value type section. I then wanted to see nullable reference types in the reference type section below it. It wasn't there.

https://learn.microsoft.com/en-us/dotnet/csharp/nullable-references
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/nullable-value-types

IMO, this is sort of confusing general nullability and null handling as a language affordance with nullable reference types as a specific feature.

@BillWagner @KathleenDollard