Check out this sample: Effective Dart: Documentation | Dart
I find it much cleaner than the default Java/Kotlin doc-comment.
Just a personal opinion from a non-darter:
The precedent of javadoc has established a cultural pattern of using /* for prose and // for disabled code and it would a major decision for kotlin to actively break away from this legacy.
That being said, many moons ago I used some c++ javadoc clone that allowed //< syntax for comments on the end of the line (or perhaps the clone was doxygen and it was actually the slightly more cumbersome //!< or ///<) and I still regionally miss this possibility, despite not having touched any code where that worked for almost two decades.