add note about after_script being run separately
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
What does this MR do?
clarify execution of after_script
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
clarify execution of after_script