Honestly, I had written most of the next change using the old syntax and then saw this in some new changes when I rebased. I already had in my mind to ask for a shorter syntax as the old one is pretty verbose, especially compared to the old SGML entities we had for DocBook. The man: keyword is quite nice though and is as compact as the old style.
I like the ruby macro processed keywords better too, so if nobody else steps up I'll probably do a pass to change all of them?
Assuming this looks good once rendered using make run or make build, you've got my approval to commit it.