Update 7.6-to-7.7.md
Created by: BaBL86
Fixed gitlab-shell version in guide (because of GitLab Shell version >= 2.4.1 ? ... FAIL. Please update gitlab-shell to 2.4.1 from 2.4.0)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: BaBL86
Fixed gitlab-shell version in guide (because of GitLab Shell version >= 2.4.1 ? ... FAIL. Please update gitlab-shell to 2.4.1 from 2.4.0)