Update needed for output from --help option

[vincent-lowe]

In response either to --help, or to a bad command line, the output contains an error in the example model that is shown.

To Reproduce
Steps to reproduce the behavior:

1. Submit the command: dw --help
2. Notice that the output example contains an error
3. Confirm that the model example shown will not work by submitting it as a command
4. Confirm that the README.md also exhibits the error.