message: update Link example props
diff: @@ -283,10 +283,10 @@ const Index = props => (
  <Link muted href='https://github.com'>Link muted</Link>
  </Block>
  <Block mb={1}>
  - <Link scheme='gray' href='https://github.com'>Link scheme='gray'</Link>
  + <Link gray href='https://github.com'>Link gray</Link>
  </Block>
  <Block mb={1}>
  - <Link scheme='gray-dark' href='https://github.com'>Link scheme='gray-dark'</Link>
  + <Link graydark href='https://github.com'>Link graydark</Link>
  </Block>
  </Example>
  <Example name='StateLabel'>
  