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

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)


Simplify lns. 45-47 to:
A DN includes a number of fields, but some can be left blank (by entering a `.`). Other fields can be left with their default values.