Edits and fixes based on review.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
In response to your previous objection, I simplified this. Your rewrite omits information the SME, @tianon , felt was important to convey. I have tried to preserve that information while simplifying the prose. It now consists of two declarative, single-clause sentences. That seems entirely reasonable to me.