Update 5.1-to-5.2.md
Created by: burmjohn
/home/git/gitlab/public/uploads is missing if going from 5.1 to 5.2
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: burmjohn
/home/git/gitlab/public/uploads is missing if going from 5.1 to 5.2