(..well maybe not so much censored as rejected by editors/"No can do")
Know any examples? Here's some Ive seen or heard about :
Shatterstar stabs Juggernaut in the eye (Liefield X-force/Mcfarlane Spidey crossover)
"The K#### known as Sabretooth" . Dunno how the anti-semitic slur got there but the issue was withdrawn but not without a few copies circulating...
Princess Diana as a member of Mike Allred's Xforce
Others?