Update expected usage string
Update expected usage string

tabbott/regtools,gatoravi/regtools,gatoravi/regtools,gatoravi/regtools,gatoravi/regtools,tabbott/regtools,griffithlab/regtools,tabbott/regtools,griffithlab/regtools,griffithlab/regtools,tabbott/regtools,griffithlab/regtools,griffithlab/regtools,tabbott/regtools,gatoravi/regtools,griffithlab/regtools