doc: Update Gitlab admin and schema docs (!3436) · Merge requests · Warren Gifford / sourcegraph · GitLab

Warren Gifford requested to merge core/gitlab-docs into master Apr 16, 2019

Created by: keegancsmith

Followed the same pattern used by GitHub for 3.3 release.

Test plan: Visited docs page. See screenshots.

Fixes https://github.com/sourcegraph/sourcegraph/issues/3042 Part of #2025 (closed)