mass-cli "nodes new" command: autodetect_nodegroup parameter is undocumented

[Mike Pontillo]

When adding a node from the CLI, the "autodetect_nodegroup" parameter isn't mentioned in the help text. (it is, however, mentioned in error messages.)

$ maas root nodes new
'autodetect_nodegroup' must be specified if 'nodegroup' parameter missing

The help text states, in part:

The minimum data required is:
architecture=<arch string> (e.g. "i386/generic")
mac_addresses=<value> (e.g. "aa:bb:cc:dd:ee:ff")

But nothing about autodetect_nodegroup (nor its data type, nor its alternatives) are mentioned.