[11.9] Revert "Remove HipChat integration from GitLab"

See merge request gitlab-org/gitlab-ce!27257

Evan Read authored 6 years ago and Achilleas Pipinellis committed 6 years ago

Markdown renderers find it easier to determine
where lists start and end when lists are surrounded
by new lines.

For consistency, also ensure entries in the list
are aligned when they span multipls lines.

Add documentation for both admins (/user/admin_area/abuse_reports.md)
and non-admins (/user/abuse_reports.md) to help them use
the abuse reports feature

From https://gitlab.com/gitlab-org/gitlab-ce/issues/36760

Was reverted in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14373