Improve app emoji documentation (#7012)

* clarification

* add application-owned emoji

Author: ManHatos

docs/resources/Emoji.md

@@ -29,6 +29,13 @@ An emoji cannot have both subscription roles and non-subscription roles.
 Emojis with subscription roles are considered premium emoji, and count toward a separate limit of 25.  
 Emojis cannot be converted between normal and premium after creation.
 
+###### Appication-Owned Emoji
+
+An application can own up to 2000 emojis that can only be used by that app.
+App emojis can be managed using the API with a bot token, or using the app's settings in the portal.
+The `USE_EXTERNAL_EMOJIS` permission is not required to use app emojis.
+The `user` field of an app emoji object represents the team member that uploaded the emoji from the app's settings, or the bot user if uploaded using the API.
+
 ###### Emoji Example
 
 ```json
@@ -187,4 +194,4 @@ Modify the given emoji. Returns the updated [emoji](#DOCS_RESOURCES_EMOJI/emoji-
 
 ## Delete Application Emoji % DELETE /applications/{application.id#DOCS_RESOURCES_APPLICATION/application-object}/emojis/{emoji.id#DOCS_RESOURCES_EMOJI/emoji-object}
 
-Delete the given emoji. Returns `204 No Content` on success.
+Delete the given emoji. Returns `204 No Content` on success.