Maintenance: 9.2.1.1 Reference to "document" and "you" in text

Unchanged sentences from the take-over of the original document are now misleading.

Paragraph reads "You should follow the recommendations in this document if you are a scenario developer writing scenarios for real use. By following the recommendations in this guide the code becomes easy to understand for you and other users."

Should be rephrased to "Scenario developers should follow the recommendations in this chapter to write scenario code that is easy to read and understand."