trivial: Fix GtkDoc for fu_common_get_block_devices()
trivial: Fix GtkDoc for fu_common_get_block_devices()

hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd