Update 'scoop help cache' to show example of removing everything from cache (see #1288)
Update 'scoop help cache' to show example of removing everything from cache (see #1288)

lukesampson/scoop,reelsense/scoop,berwyn/scoop,rasa/scoop,toxeus/scoop,nikolasd/scoop,vinaynambiar/lukesampson-,kodybrown/scoop,rodericktech/scoop,coonce/scoop,vidarkongsli/scoop,nueko/scoop,bpollack/scoop,r15ch13/scoop,Congee/scoop,yunspace/scoop,Cyianor/scoop