Trivial Description
The CLI admin -servers command gives an example in the documentation:
$ oozie admin http://localhost:11000/oozie -servers OozieA : http://localhost:11000/oozie OozieB : http://localhost:12000/oozie OozieC : http://localhost:13000/oozie
The command is missing the -oozie before the address.
It would also probably be more clear if they were different hosts instead of the same host with different ports (same with the REST docs).