change author of past commits code example

Example 1: git change commit author for all commits

# Changes the username and email of all commits from the start.
git rebase -i --root -x "git commit --amend --author='YOUR_USERNAME <[email protected]> --no-edit'"

Example 2: git change author of last 2 commits

git rebase -i YOUR_SHA -x "git commit --amend --author 'New Name <[email protected]>' -CHEAD"