In the interactive rebase editor, the r command stands for "reword." When you use r in front of a commit, it indicates that you want to change the commit message of that particular commit while keeping the changes in the commit itself.
For example, if you have a commit that you want to modify the message for, you would prefix it with r in the interactive rebase editor. After saving and closing the editor, Git will prompt you to enter a new commit message for that commit.
This allows you to update the commit message without altering the actual changes made in that commit.
