[RFE] [doc] document udev properties honored by NetworkManager
We should document the udev properties that we honor in man NetworkManager. At least, the clearly relevant ones for NetworkManager, like NM_UNMANAGED, NM_AUTO_DEFAULT_LINK_LOCAL_ONLY/ID_NET_AUTO_LINK_LOCAL_ONLY and ID_NET_DHCP_BROADCAST (maybe not the obvious ones like DRIVER or IFINDEX).