To amend a commit message after it has been pushed to remote. ONLY if sure no one else has pulled/pushed from it.
[specify n as number of commits you want to view/amend]
git rebase -i HEAD~n
[need interactive change where change word pick to reword on each file to change]
[save and close and then interactively alter the commit message in the editor. save and close]
[force push to remote]
git push --force
https://www.educative.io/answers/how-to-change-a-git-commit-message-after-a-push