Clarify new Twitter flow
Per https://gitlab.com/gitlab-com/marketing/issues/46 (internal issue)
\cc @AshleyS @jnassi @cabargas @kelvinmutuma @dblessing @balameb @patricio
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Per https://gitlab.com/gitlab-com/marketing/issues/46 (internal issue)
\cc @AshleyS @jnassi @cabargas @kelvinmutuma @dblessing @balameb @patricio