Add more information and refactor format of award emoji-related topics

doc/user/award_emojis.md

 # Award emoji
 
-> **Notes:**
-> - First [introduced][1825] in GitLab 8.2.
-> - GitLab 9.0 [introduced][ce-9570] the usage of native emojis if the platform
+> - First [introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1825) in GitLab 8.2.
+> - GitLab 9.0 [introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9570) the usage of native emojis if the platform
 >  supports them and falls back to images or CSS sprites. This change greatly
->  improved the award emoji performance overall.
+>  improved award emoji performance overall.
 
 When you're collaborating online, you get fewer opportunities for high-fives
-and thumbs-ups. Emoji can be awarded to issues, merge requests, snippets, and
-virtually everywhere where you can have a discussion.
+and thumbs-ups. Emojis can be awarded to [issues](project/issues/index.md), [merge requests](project/merge_requests/index.md),
+[snippets](snippets.md), and virtually everywhere where you can have a discussion.
 
 ![Award emoji](img/award_emoji_select.png)
 
-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.
+Award emojis make it much easier to give and receive feedback without a long
+comment thread. Comments that are only emojis will automatically become
+award emojis.
+
+For information on the relevant API, see [Award Emoji API](../api/award_emoji.md).
 
 ## Sort issues and merge requests on vote count
 
-> [Introduced][2871] in GitLab 8.5.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2781) in GitLab 8.5.
 
 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
@@ -32,20 +33,16 @@ downvotes.
 
 ## Award emoji for comments
 
-> [Introduced][4291] in GitLab 8.9.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/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. If you want to remove an award emoji, just click
-the emoji again and the vote will be removed.
+To:
+
+- Add an award emoji, click the smile in the top right of the comment and pick an emoji from the dropdown.
+- Remove an award emoji, click the emoji again and the vote will be removed.
 
 ![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)
-
-[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
-[ce-9570]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9570