A little error in the documentation of dce.go
A little error in the documentation of dce.go

I think that could be an error in the documentation of [NewDCEGroup](https://github.com/google/uuid/blob/281f560d28af7174109514e936f94c2ab2cb2823/dce.go#L53) and [NewDCEPerson](https://github.com/google/uuid/blob/281f560d28af7174109514e936f94c2ab2cb2823/dce.go#L45)
google/uuid