message: fix latest version redirection example
diff: <tr>
  <td>
  - <a href="https://docs.rs/clap/*/clap/struct.App.html">docs.rs/clap/*/clap/struct.App.html</a>
  + <a href="https://docs.rs/clap/*">docs.rs/clap/*</a>
  </td>
  <td>
  Latest version of this page (if it still exists). "latest" or "newest" work as well as
  