Docs review: Separate feature flag for each analytics feature

References

Merged MR that introduced documentation requiring review: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/16102 and https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32641

Related issue(s): https://gitlab.com/gitlab-org/gitlab-ee/issues/14671

Further Details

See also discussion at https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/16102#note_214691697

/cc @valexieva @ahegyi