title: How to resume review process after updating pull request at GitHub?
body: <p>I forked GitHub repository and created pull request. Reviewer requested changes from me:</p>
  <p><a href="https://i.stack.imgur.com/KZiwf.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KZiwf.png" alt="Github changes requested" /></a></p>
  <blockquote>
  <p>Changes requested<br />
  1 review requesting changes by reviewers with write access. <a href="https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-request-reviews" rel="noreferrer">Learn more.</a></p>
  </blockquote>
  <p>I've committed and pushed necessary changes in pull request branch, so they are displaying at pull request page. Now I want ask contributor to continue review my changes.</p>
  <p>Is there any button or action for this? Can't find this.</p>
  <p><a href="https://i.stack.imgur.com/VbpIB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/VbpIB.png" alt="Buttons" /></a></p>