Add Configuration Change Log status decriptions
What does this MR do and why?
This MR updates Configuration Change Log documentation with status descriptions.
Relates to Switchboard Tenant Admin Config Change Log MVC (https://gitlab.com/groups/gitlab-com/gl-infra/gitlab-dedicated/-/epics/337) Related issue: https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/team/-/issues/4456