[doc] Using the CLI command "user" to set groups is confusing

The explanation how to add user to groups is confusing.

I read that I have to create a group with a name and password to use it, but a groups does not have any password.
The command "user create --groups=developers developers -p changeme" will create a user 'developers' aligned to the group 'developers'.

The description would be better to explain for the user create command that the user can be directly assigned to groups with --groups.
And the "user groups" command can be used to add an existing user to a group like

"user groups --groups=developers wfink"

This will add the user 'wfink' to the 'developers' group, no matter whether the group already exists or not!