refer to character handling in UFL design guide

Author: colinloretz

docs/discord-social-sdk/design-guidelines/unified-friends-list.mdx

@@ -65,6 +65,10 @@ It's also **scalable** and **inclusive** of provisional accounts who do not have
 
 When referring to a player's Discord Identity, please use their **Discord Display Name**, and not their username.
 
+:::info
+See [How to Manage Special Characters in Discord Display Names](/docs/discord-social-sdk/how-to/handle-special-characters-display-names) for guidance on handling special characters in text chat and friend lists.
+:::
+
 ![Discord display names](images/social-sdk/design-guidelines/UFL-07.png)
 
 ## Scaling to Multiple Platforms