Add legacy DM events to XAA

Author: tcaldwell-x

x-api/activity/introduction.mdx

@@ -65,14 +65,25 @@ Spaces events are triggered when a user starts or ends a Space.
 | `spaces.start` | Fired when a user starts a Space | `user_id` |
 | `spaces.end` | Fired when a user ends a Space | `user_id` |
 
+### DM Events
+
+DM events are triggered when a user sends or receives an unencrypted direct message.
+
+| Event Name | Description | Filters |
+| --- | --- | --- |
+| `dm.received` | Fired when a user receives an unencrypted direct message | `user_id` |
+| `dm.sent` | Fired when a user sends an unencrypted direct message | `user_id` |
+| `dm.read` | Fired when a user reads the filtered users unencrypted DM message, or "read reciept" | `user_id` |
+| `dm.indicate_typing` | Fire when a user is typing a message to the filtered user | `user_id` |
+
 ### Chat Events
 
-Chat events are triggered when a user sends or receives a direct message.
+Chat events are triggered when a user sends or receives an encrypted direct message.
 
 | Event Name | Description | Filters |
 | --- | --- | --- |
-| `chat.received` | Fired when a user receives a direct message | `user_id` |
-| `chat.sent` | Fired when a user sends a direct message | `user_id` |
+| `chat.received` | Fired when a user receives an encrypted direct message | `user_id` |
+| `chat.sent` | Fired when a user sends an encrypted direct message | `user_id` |
 
 ### News Events