'List volume type' comment has fixed
'List volume type' comment has fixed

Change-Id: Ia87d7814cb3f3426875a92597847a25683467c81

bigswitch/tempest,LIS/lis-tempest,Juniper/tempest,sebrandon1/tempest,cisco-openstack/tempest,Tesora/tesora-tempest,openstack/tempest,openstack/tempest,masayukig/tempest,zsoltdudas/lis-tempest,vedujoshi/tempest,Tesora/tesora-tempest,masayukig/tempest,cisco-openstack/tempest,vedujoshi/tempest,bigswitch/tempest,Juniper/tempest,zsoltdudas/lis-tempest,sebrandon1/tempest,LIS/lis-tempest