QR factorization organizational clarification

[peepeetee]

So um, as discussed in person, I propose that it would be a good idea to reorganize around page 112 to make the motivation for reflections appear before how reflections are done

also now that I have looked at it more, page 108 is what I missed that would have made it clearer, but I would suggest clarifying page 108 a little bit more to aid comprehension

[inducer]

Thanks for the report! a4c2655 did some of that. I've just updated the online PDF to reflect that. Does that address what you were looking for, or is anything else needed?