lxd/list: Add description in command help section about devices:KEY:NAME:WIDTH and config:KEY:NAME:WIDTH support
lxd/list: Add description in command help section about devices:KEY:NAME:WIDTH and config:KEY:NAME:WIDTH support

Signed-off-by: Sava Radoš <93e357e841ff1f06dc3391a307db95db8e34ad90@bitsfactory.com>

stgraber/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,Skarlso/lxd,stgraber/lxd,lxc/lxd,atxwebs/lxd,Skarlso/lxd,atxwebs/lxd,mjeanson/lxd,mjeanson/lxd,Skarlso/lxd,atxwebs/lxd,mjeanson/lxd,Skarlso/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd