dom0/qvm-usb: added description to usb_list() and usb_check_attached() methods
dom0/qvm-usb: added description to usb_list() and usb_check_attached() methods

QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin