Slight fixes for role descriptions
Slight fixes for role descriptions

According to comments to https://review.openstack.org/190714

Change-Id: I3e55cacf10e62c915d5b6d9012ba8d7a2cae3038

huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,huntxu/fuel-web,nebril/fuel-web,prmtl/fuel-web,nebril/fuel-web,nebril/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,stackforge/fuel-web,huntxu/fuel-web,stackforge/fuel-web,huntxu/fuel-web,prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,prmtl/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,SmartInfrastructures/fuel-web-dev