Reword some paragraphs to make things clearer.

Bug: None
Change-Id: Icd62b3156d6b0f0d31328513608acabadab89d38
Reviewed-on: https://chromium-review.googlesource.com/1139020Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>