[DOC] Mention the @all GFM reference in documentation (!7420) · Merge requests · Import/Export Testing Group / gitlabhq_1643245269 · GitLab

Do not update/delete: Banner broadcast message test data

Do not update/delete: Notification broadcast message test data

Matthias Käppler requested to merge github/fork/Razer6/mention_all_markup into master Aug 03, 2014

Created by: Razer6

What does this MR do?

This PR adds documentation of the @all reference available since GitLab 7.1

/cc @jvanbaarsen