It should look a little more like so (aligned hyphens, no whitespace line, fixed typo in dictionary, changed wording)

```
// dictionary   - The dictionary whose keys and values should be transformed
//                between.
// defaultValue - The result to fall back to, in case key was not found in
//                dictionary.
```

Wasn't quite sure what `This is helpful for non object property types.` is supposed to mean…