Escape Artist: Your First vim Edit

The ops team drafted a message-of-the-day for this server, but nobody dared open vim to fix the typo in it. The draft lives at /root/motd-draft.txt and greets users with 'Welcom to Signal9' — one letter short of professional. Open the file in vim, fix the spelling to 'Welcome to Signal9', save, and quit. That's the whole mission: get in, make one edit, get out alive. (Yes, the 'how do I exit vim' rite of passage — defanged.)