tell the user what to expect, including that it is a verbode process.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Merge pull request #7398 from SvenDowideit/add-more-details-to-https-docs

tell the user what to expect, including that it is a verbose process.