Consummate help doc of openstack role list --domain [...]

[Summer]

openstack command: openstack role list
now we can see doc:
stack@os-devstack-1:~/devstack$ openstack role list -h
usage: openstack role list [-h] [-f {csv,json,table,value,yaml}] [-c COLUMN]
                           [--max-width <integer>] [--noindent]
                           [--quote {all,minimal,none,nonnumeric}]
                           [--domain <domain> | --project <project>]
                           [--user <user> | --group <group>]
                           [--group-domain <group-domain>]
                           [--project-domain <project-domain>]
                           [--user-domain <user-domain>] [--inherited]

List roles

optional arguments:
  -h, --help show this help message and exit
  --domain <domain> Include <domain> (name or ID)
  --project <project> Include <project> (name or ID)
  --user <user> Include <user> (name or ID)
  --group <group> Include <group> (name or ID)
  --group-domain <group-domain>
                        Domain the group belongs to (name or ID). This can be
                        used in case collisions between group names exist.
  --project-domain <project-domain>
                        Domain the project belongs to (name or ID). This can
                        be used in case collisions between project names
                        exist.
  --user-domain <user-domain>
                        Domain the user belongs to (name or ID). This can be
                        used in case collisions between user names exist.
  --inherited Specifies if the role grant is inheritable to the sub
                        projects
the help doc of the optional arguments is too fuzzy,such as '--domain'. when i see the doc , i can't know what it's mean. I hope it can be consummate so that user can know easily

[Steve Martinelli (stevemar)]

We're re-working the role list help for 3.0.0, closing this one out for now, re-open if still applicable