Update command in help test to match current name
Update command in help test to match current name

Refs: https://bugs.launchpad.net/juju/+bug/1636347

anastasiamac/juju,mikemccracken/juju,mikemccracken/juju,alesstimec/juju,waigani/juju,waigani/juju,mjs/juju,alesstimec/juju,alesstimec/juju,ericsnowcurrently/juju,anastasiamac/juju,mikemccracken/juju,waigani/juju,mjs/juju,mjs/juju,bac/juju,waigani/juju,marcmolla/juju,alesstimec/juju,ericsnowcurrently/juju,mjs/juju,mikemccracken/juju,bac/juju,bac/juju,marcmolla/juju,marcmolla/juju,mjs/juju,mjs/juju,marcmolla/juju,marcmolla/juju,mjs/juju,mikemccracken/juju,ericsnowcurrently/juju,anastasiamac/juju,bac/juju,ericsnowcurrently/juju,anastasiamac/juju,ericsnowcurrently/juju,anastasiamac/juju,alesstimec/juju,bac/juju