message: switch up custom StateLabel icon example
diff: @@ -308,11 +308,7 @@ const Index = props => (
  <StateLabel small bg='purple'>Purple</StateLabel>
  </span>
  <span className='mr-2'>
  - <StateLabel small bg='green'>
  - <span className='octicon'>
  - <Octicon name='git-branch'/>
  - </span>
  - {' '}
  + <StateLabel small bg='green' icon={<Octicon name='git-branch'/>}>
  Custom Octicon
  </StateLabel>
  </span>
  