Document custom Git hook error message (!5088) · Merge requests · GitLab.org / GitLab FOSS · GitLab

Achilleas Pipinellis - OOO until November 25th (parental leave) requested to merge doc-custom-githook-ui into master Jul 05, 2016

What does this MR do?

Documents new functionality introduced by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5073

Does this MR meet the acceptance criteria?

Documentation created/updated
Conform by the style guides