Update CI API docs
Since CI is now part of GitLab, it makes sense to group all API related endpoints under one location. This is a step towards the much awaited issue of doc restructure https://gitlab.com/gitlab-org/gitlab-ce/issues/3349
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Since CI is now part of GitLab, it makes sense to group all API related endpoints under one location. This is a step towards the much awaited issue of doc restructure https://gitlab.com/gitlab-org/gitlab-ce/issues/3349