Fix an invalid command in the "adduser -h" output (DBTS: #573155)
I never liked the overlap in functionality of the various commands provided by the adduser package. I think adduser should only add users and addgroup should only add groups. The idea of adduser --group foo creating a group named foo seems to be poor style. This is probably just leftover functionality from the early days of the command when it was being developed.
Anyway, I went with the simple path here of fixing the invalid command in adduser -h. The command it shows now is valid, but I hope that its usage will be discouraged and, one day, removed entirely.
Let me know what you think!