Update doc/docker/README.md: fix port number under "Expose GitLab on different... (!3530) · Merge requests · GitLab.org / omnibus-gitlab

michael requested to merge mic00/omnibus-gitlab:master into master Aug 20, 2019

Update doc/docker/README.md: fix port number under "Expose GitLab on different ports" and clarify language slightly

Update doc/docker/README.md: fix port number under "Expose GitLab on different...