Expand on Award Emoji documentation, update/add screenshots. [ci skip]

doc/workflow/award_emoji.md

-# Award emojis
+# Award emoji
 
 >**Note:**
 This feature was [introduced][1825] in GitLab 8.2.
 
 When you're collaborating online, you get fewer opportunities for high-fives
-and thumbs-ups. In order to make virtual celebrations easier, you can now vote
-on issues and merge requests using emoji!
+and thumbs-ups. Emoji can be awarded to issues and merge requests, making
+virtual celebrations easier.
 
 ![Award emoji](img/award_emoji_select.png)
 
-This makes it much easier to give and receive feedback, without a long comment
-thread. Any comment that contains only the thumbs up or down emojis is
-converted to a vote and depicted in the emoji area.
-
-You can then use that functionality to sort issues and merge requests based on
-popularity.
+Award emoji make it much easier to give and receive feedback without a long
+comment thread. Comments that are only emoji will automatically become
+award emoji.
 
 ## Sort issues and merge requests on vote count
 
 >**Note:**
 This feature was [introduced][2871] in GitLab 8.5.
 
-You can quickly sort the issues or merge requests by the number of votes they
-have received. The sort option can be found in the right dropdown menu.
+You can quickly sort issues and merge requests by the number of votes they
+have received. The sort options can be found in the dropdown menu as "Most
+popular" and "Least popular".
 
 ![Votes sort options](img/award_emoji_votes_sort_options.png)
 
@@ -40,9 +38,28 @@ Sort by least popular issues/merge requests.
 
 ---
 
-The number of upvotes and downvotes is not summed up. That means that an issue
-with 18 upvotes and 5 downvotes is considered more popular than an issue with
-17 upvotes and no downvotes.
+The total number of votes is not summed up. An issue with 18 upvotes and 5
+downvotes is considered more popular than an issue with 17 upvotes and no
+downvotes.
+
+## Award emoji for comments
+
+>**Note:**
+This feature was [introduced][4291] in GitLab 8.9.
+
+Award emoji can also be applied to individual comments when you want to
+celebrate an accomplishment or agree with an opinion.
+
+To add an award emoji, click the smile in the top right of the comment and pick
+an emoji from the dropdown.
+
+![Picking an emoji for a comment](img/award_emoji_comment_picker.png)
+
+![An award emoji has been applied to a comment](img/award_emoji_comment_awarded.png)
+
+If you want to remove an award emoji, just click the emoji again and the vote
+will be removed.
 
 [2871]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2781
 [1825]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1825
+[4291]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4291