fix wrapping with command examples
fix wrapping with command examples

turns this:

```
▸    To drain to splunk do the following:
▸    $ heroku drains:add -a heroku-npm https://$(foo > /dev/null; foo-client
▸    MAP | awk -F '|' {print
▸    $2}')@logs.foo.com/logs
```

into this:

```
▸    To drain to splunk do the following:
▸    $ heroku drains:add -a heroku-npm https://$(foo > /dev/null; foo-client MAP | awk -F '|' {print $2}')@logs.foo.com/logs
```

heroku/heroku-cli-util,heroku/heroku-cli-util