Re-annotate models

app/models/broadcast_message.rb

app/models/deploy_key.rb

app/models/deploy_keys_project.rb

app/models/email.rb

app/models/event.rb

app/models/forked_project_link.rb

app/models/group.rb

app/models/issue.rb

app/models/key.rb

app/models/merge_request.rb

app/models/merge_request_diff.rb

app/models/milestone.rb

app/models/namespace.rb

app/models/note.rb

app/models/personal_snippet.rb

app/models/project.rb

app/models/project_hook.rb

app/models/project_services/assembla_service.rb

app/models/project_services/campfire_service.rb

app/models/project_services/emails_on_push_service.rb