We end up with:

```
Usage:
  bin/rails routes [options]

Options:
  -c, [--controller=CONTROLLER]      # Filter by a specific controller, e.g. PostsController or Admin::PostsController.
  -g, [--grep=GREP]                  # Grep routes by a specific pattern.
  -E, [--expanded], [--no-expanded]  # Print routes expanded vertically with parts explained.
```

which does miss the bit about routes being printed in order.

Also:

* Renames options to ease help output readability, then clarifies each option.
* Fixes a bunch of indentation.