Fixed spelling error on about aws page. Changed exiting user to existing user.
https://about.gitlab.com/aws/ contains a spelling error.
"Visit the public ip in a browser and sign in as an exiting user"
I changed exiting to existing.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
https://about.gitlab.com/aws/ contains a spelling error.
"Visit the public ip in a browser and sign in as an exiting user"
I changed exiting to existing.