Of course I don't know what your tutorial will look like...
But personally, I would not need an extensive how-to-manual.
I would only need the steps (example) on how to fill in the Facebook form for review.
May I suggest you could add the video too, that is required for submission?
Since the process would be the same for anyone using your extension anyway (I assume).
Yes, we are preparing it to recommend a procedure. Facebook warns that reviews could take weeks... since at this time there's a long queue. Facebook is still implementing changes so it is possible that they could change the procedure again.