Cleanup `rspec --help`

Notice the utilities section:

```
  **** Utility ****

    -v, --version                    Display the version.
    -d
        --I
    -h, --help                       You're looking at it.
```

`-d` and `--I` are there because of the invalid option handling you added, @JonRowe.  Can you see if there's a way to hide them?