Script episode indicates time for exercise, but there is no exercise

[bencomp]

Originally posted by @leannethelibrarian in #95 (comment)

Scripts episode:

• Overview - it says "exercises 10 min" but there are no exercises indicated for this lesson.
• Saving you work as a script section - bullet "1" appears twice (before and after the screenshot)

I think the intent was that there is no real distinction between teaching and exercise. In other words, the steps could be presented as a walk-through that instructor and learners do together, or be presented as the exercise.

Let me suggest that there be two exercise blocks:

1. Saving actions to a script
2. Applying the actions and checking that the results are the same

I'll happily accept a pull request to make these changes.

Checking that the results are the same can be important. I have noticed that changing the value of a single cell in the 'table' may not be recorded as an exportable action. That may vary with OpenRefine versions, but we probably should warn about this. (I can open a new issue for this.)