Note upgrade recommendations for docker upgrade
Problem:
Command examples pull gitlab:latest, which can be multiple versions out of date. Going from 11.x directly to latest version skips an important step for going between major upgrades. People running GitLab 11 might not know to stop at 12.0.latest-minor. Not stopping at 12.0 may cause missing migrations or db columns.
Solution (Documentation):
Link to suggested upgrade paths in the documentation for GitLab Docker upgrades across major versions.