Fix typo: damain -> domain (#5756)
Fix typo: damain -> domain (#5756)

Fix typo: damain -> domain in certbot/util.py:607
letsencrypt/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,letsencrypt/letsencrypt,lmcro/letsencrypt