I may have missed a way to do this, but as far as I can tell, it doesn't exist. It would be great to have a way in DocumentMethod to tell if there is meta data specifiers attached to a method and then put the comment above the specifiers.
That's actually a very good point, and I am a little surprised it doesn't seem to have come up before. I have put in a bug report for this, that isn't really the right location for the comment to be placed:
Unfortunately our bug tracker is private, so you cannot see it directly, but you can ask for updates. Currently this is in the list but hasn't yet been reviewed. I am hoping this will be fairly simple to address, when we get to it, but until we get a proper estimate that's all I can really say.