Revert "Remove enterprise-only note for follow events"

This reverts commit 8678a89.

Author: tcaldwell-x

x-api/activity/introduction.mdx

@@ -10,12 +10,6 @@ The X Activity API (XAA) endpoint group allows developers to tap in to activity
 
 A developer can subscribe to events they are interested in such as `profile.update.bio`, `profile.update.profile_picture` etc. and filter for the User ID whose events they want. The matching events for that User ID will be delivered to your app with sub-second latency.
 
-<Warning>
-The X Activity API is available as an open beta. While in open beta, please expect potential bugs, breaking changes, or incomplete features.
-
-Your feedback is invaluable—report issues via our [developer community forums](https://devcommunity.x.com/).
-</Warning>
-
 ## Delivery Mechanisms
 
 The X Activity API currently supports the following delivery mechanisms to send events to your app:
@@ -37,20 +31,24 @@ Profile events are triggered when a user makes changes to their profile informat
 | `profile.update.profile_picture` | Fired when a user updates their profile picture | `user_id` |
 | `profile.update.banner_picture` | Fired when a user updates their profile banner | `user_id` |
 | `profile.update.screenname` | Fired when a user updates their display name | `user_id` |
+| `profile.update.handle` | Fired when a user updates their handle | `user_id` |
 | `profile.update.geo` | Fired when a user updates their profile location | `user_id` |
 | `profile.update.url` | Fired when a user updates their profile website URL | `user_id` |
 | `profile.update.verified_badge` | Fired when a user updates their verified badge | `user_id` |
 | `profile.update.affiliate_badge` | Fired when a user updates their affiliate badge | `user_id` |
 
 ### Follow Events
 
-Follow events are triggered when a user follows or unfollows another user.
+Follow events are triggered when the filtered user follows another user, or is followed by another user.
 
 | Event Name | Description | Filters |
 | --- | --- | --- |
 | `follow.follow` | Fired when a user follows another user | `user_id` |
 | `follow.unfollow` | Fired when a user unfollows another user | `user_id` |
 
+<Note>
+**Enterprise Only:** The `follow.follow` and `follow.unfollow` events are only available to Enterprise and Partner tier accounts at this time.
+</Note>
 
 ### Spaces Events
 
@@ -61,14 +59,27 @@ 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` |
 
+### Legacy DM Events
+
+Legacy DM events pertain to the legacy, unencrypted DM system.
+
+| 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` | Fired 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 pertain to the new, encrypted messaging stack, or XChat.
 
 | 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` |
+| `chat.conversation_join` | Fired when a user joins an encrypted chat conversation | `user_id` |
+
 
 ### News Events