factor.sh: fix docs, bootstrap doesn't recompile.
factor.sh: fix docs, bootstrap doesn't recompile.

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