Documentation (#6803)

* Update icons-emojis.md

The link no longer works, it seems X has removed it completely.

* Updated per squidfunks suggestion.

Author: jjasghar

docs/reference/icons-emojis.md

@@ -83,8 +83,7 @@ the shortcodes at [Emojipedia]:
 :smile:
 
 </div>
-
-  [Twemoji]: https://twemoji.twitter.com/
+  [Twemoji]: https://github.com/twitter/twemoji
   [Emojipedia]: https://emojipedia.org/twitter/
 
 ### Using icons