title: Meaning of branch policy "Require at least one approval at the last iteration" unclear
body: <br>
  we have configured branch policies for our default branch.
  <p>We also want to configure what happens when a new commit is pushed to make sure the new commit is properly reviewed before completing the pull request. There is the option &quot;Require at least one approval at the last iteration&quot;. I could not find any sophisticated documentation about it. Therefore I have some questions about it:</p>
  <p>How does this compare to the other &quot;Reset&quot; options that are available?
  What does &quot;last iteration&quot; mean here? Is it the state before the new commit was pushed?</p>
  <p>What happens to the existing votes (e.g. Approve) when a new commit is pushed?</p>