title: How to really delete a commit on VSTS / Azure-devops
body: <p>I'm working on VS 2017 and we have a cloud VSTS / Azure-devops.</p>
  
  <p>I recently committed and pushed... and realized that 8 files were not supposed to be in it.
  after that I committed again a clean one and pushed in to remote.</p>
  
  <p>Now I can see both commit in VSTS website / portail.</p>
  
  <p>The thing is I need to create a PULL REQUEST, and when I try to create a pull request, I found myself with the first commit file inside the pull request... which I don't want.</p>
  
  <p>So I just need to delete the first commit I did, and create a pull request for the second clean commit. How do I go by? cause I searched and couldn't find a clear explanation on how to do?</p>