terminal/command: Update `clearall` help text
terminal/command: Update `clearall` help text

alexbrainman/delve,dlsniper/delve,dr2chase/delve,go-delve/delve,dr2chase/delve,dr2chase/delve,visualfc/delve,alexbrainman/delve,aarzilli/delve,ggndnn/delve,ignatov/delve,ignatov/delve,go-delve/delve,go-delve/delve,ggndnn/delve,go-delve/delve,derekparker/delve,ignatov/delve,aarzilli/delve,visualfc/delve,alexbrainman/delve,aarzilli/delve,go-delve/delve,visualfc/delve,derekparker/delve,dlsniper/delve,ggndnn/delve,dlsniper/delve,aarzilli/delve,derekparker/delve