Copyedit builds

Trying again since the first PR seems to have been lost.

Docker-DCO-1.1-Signed-off-by: Fred Lifton fred.lifton@docker.com (github: fredlf)
That makes sense.
If everybody else agrees with you on this, and if things are kept consistent across the docs and apps/sites when talking about all Docker Hub features, I will, quite happily, LGTM.