Added list items to the steps about SSH access for docker

Open username-removed-948711 requested to merge paulcodiny/gitlab-ee:patch-2 into master

See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html

What does this MR do?

Really small improvement - it's not very visible that after code block there is another fourth step.
List items were added to the steps to improve the situation

Moving docs to a new location?

Nope