compiler.units: fix documentation for pair of hash-sets.
compiler.units: fix documentation for pair of hash-sets.

AlexIljin/factor,slavapestov/factor,bpollack/factor,tgunr/factor,mrjbq7/factor,factor/factor,nicolas-p/factor,sarvex/factor-lang,nicolas-p/factor,factor/factor,dch/factor,dch/factor,slavapestov/factor,AlexIljin/factor,factor/factor,factor/factor,AlexIljin/factor,nicolas-p/factor,sarvex/factor-lang,bpollack/factor,bjourne/factor,nicolas-p/factor,bpollack/factor,AlexIljin/factor,bjourne/factor,sarvex/factor-lang,factor/factor,dch/factor,dch/factor,factor/factor,slavapestov/factor,sarvex/factor-lang,nicolas-p/factor,mrjbq7/factor,slavapestov/factor,AlexIljin/factor,bpollack/factor,sarvex/factor-lang,tgunr/factor,AlexIljin/factor,mrjbq7/factor,bjourne/factor,bjourne/factor,tgunr/factor,slavapestov/factor,mrjbq7/factor,mrjbq7/factor,dch/factor,bpollack/factor,bjourne/factor,slavapestov/factor,slavapestov/factor,bpollack/factor,dch/factor,mrjbq7/factor,bjourne/factor,sarvex/factor-lang,tgunr/factor,bjourne/factor,nicolas-p/factor,nicolas-p/factor,sarvex/factor-lang,tgunr/factor,bpollack/factor,tgunr/factor,AlexIljin/factor