Update doc with new file templates
File templates: https://docs.gitlab.com/ee/user/project/repository/web_editor.html#template-dropdowns
New templates: review apps 9.1 post // 9.1 post
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
File templates: https://docs.gitlab.com/ee/user/project/repository/web_editor.html#template-dropdowns
New templates: review apps 9.1 post // 9.1 post