risto docs: update preconditions, whitespace.
risto docs: update preconditions, whitespace.

ldtri0209/robotframework,fiuba08/robotframework,waldenner/robotframework,waldenner/robotframework,fiuba08/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,waldenner/robotframework,fiuba08/robotframework,fiuba08/robotframework,waldenner/robotframework,ldtri0209/robotframework,fiuba08/robotframework,waldenner/robotframework