tools.walker: Improve docs for breakpoint words
tools.walker: Improve docs for breakpoint words

AlexIljin/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,AlexIljin/factor,mrjbq7/factor,bpollack/factor,factor/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,factor/factor,factor/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,tgunr/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,factor/factor,tgunr/factor,tgunr/factor,tgunr/factor,AlexIljin/factor