GitHub got too slow to open this comment, so here goes. I did not write or change the wording of this paragraph. I do not currently understand what it is trying to convey.
The intended audience for this particular chapter is data researchers.
I will be happy to open a doc JIRA item, but can you please be more explicit about what it is you are looking for? I can't tell from the comment if you are saying that the term "modules" should just be changed to "xblocks", if a discussion of the new xblocks structural element and the difference between them and modules needs to be added, or if you think that the info on modules is in the wrong place and needs to be deleted or moved somewhere else...
help!