title: Modify commit message of past commit in git
body: <p>All I need to do is modify the commit message of some past commits in my branch locally, then push those modifications up to the server. I don't need to actually change any files in the past commits, and the past commits are not the most recent, they're from 2-3 commits ago.</p>
  
  <p>Most answers I've seen deal with either modifying the files of past commits, or else just modifying the most recent commit message. Neither is quite what I'm looking for.</p>
  
  <p>I'm hoping this is a quick and easy one for all you git experts :-)</p>