Fix instructions for abandoning a review

Updated the instructions for canceling a pending review to reflect the correct button actions.

Author: ashis-baral

content/pull-requests/how-tos/review-pull-requests/reviewing-proposed-changes-in-a-pull-request.md

@@ -96,7 +96,7 @@ To change the format of the diff view in this tab, click {% octicon "gear" aria-
 {% data reusables.repositories.start-file-comment %}
 1. When you're done, click **Start a review**. If you have already started a review, you can click **Add review comment**.
 
-Before you submit your review, your line comments are _pending_ and only visible to you. You can edit pending comments anytime before you submit your review. To cancel a pending review, including all of its pending comments, click **Review changes**, then click **Abandon review**.
+Before you submit your review, your line comments are _pending_ and only visible to you. You can edit pending comments anytime before you submit your review. To cancel a pending review, including all of its pending comments, click **Submit review**, then click **Discard review**.
 
 ![Screenshot of the comment field for a review. The "Abandon review" button is outlined in dark orange.](/assets/images/help/pull_requests/abandon-review-button.png)
 {% endwebui %}