Document how the new automatic review apps for docs work (!20149) · Merge requests · GitLab.org / GitLab FOSS · GitLab

Achilleas Pipinellis requested to merge docs/document-new-preview into master Jun 25, 2018

What does this MR do?

Forgot to document the new functionality of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20130.