Incorrect description of ListOfCurveSegments

From the render spec, page 28:

```
However it is perfectly valid to use the ListOfLineSegments object from the Layout package either in place
of the ListOfElements or In addition, to it.
```

In addition to the random capitalization and the spurious comma at the end, 'ListOfLineSegments' is wrong; it should be 'ListOfCurveSegments'.