Update Fin over API availability documentation (#277)

Author: auroralimin

descriptions/0/api.intercom.io.yaml

@@ -7813,7 +7813,7 @@ paths:
       operationId: notifyNewConversation
       description: |
         Notifies Intercom that a new conversation was created in your custom channel/platform. This triggers conversation creation and workflow automations within Intercom for your custom channel integration.
-        > **Note:** This endpoint is restricted to customers with access to the closed beta for "Fin over API".
+        > **Note:** This endpoint is currently under managed availability. Please reach out to your accounts team to discuss access and tailored, hands-on support.
       parameters:
         - name: Intercom-Version
           in: header
@@ -7856,7 +7856,7 @@ paths:
       operationId: notifyNewMessage
       description: |
         Notifies Intercom that a new message was sent in a conversation on your custom channel/platform. This allows Intercom to process the message and trigger any relevant workflow automations.
-        > **Note:** This endpoint is restricted to customers with access to the closed beta for "Fin over API".
+        > **Note:** This endpoint is currently under managed availability. Please reach out to your accounts team to discuss access and tailored, hands-on support.
       parameters:
         - name: Intercom-Version
           in: header
@@ -7908,7 +7908,7 @@ paths:
       operationId: notifyQuickReplySelected
       description: |
         Notifies Intercom that a user selected a quick reply option in your custom channel/platform. This allows Intercom to process the response and trigger any relevant workflow automations.
-        > **Note:** This endpoint is restricted to customers with access to the closed beta for "Fin over API".
+        > **Note:** This endpoint is currently under managed availability. Please reach out to your accounts team to discuss access and tailored, hands-on support.
       parameters:
         - name: Intercom-Version
           in: header
@@ -7960,7 +7960,7 @@ paths:
       operationId: notifyAttributeCollected
       description: |
         Notifies Intercom that a user provided a response to an attribute collector in your custom channel/platform. This allows Intercom to process the attribute and trigger any relevant workflow automations.
-        > **Note:** This endpoint is restricted to customers with access to the closed beta for "Fin over API".
+        > **Note:** This endpoint is currently under managed availability. Please reach out to your accounts team to discuss access and tailored, hands-on support.
       parameters:
         - name: Intercom-Version
           in: header
@@ -18659,7 +18659,7 @@ components:
           example: Customer
           nullable: true
     intercom_version_unstable:
-      description: Unstable Intercom API version. Used for closed beta endpoints.
+      description: Unstable Intercom API version. Used for closed beta endpoints or other features under managed availability.
       type: string
       example: unstable
       default: unstable
@@ -21367,11 +21367,11 @@ tags:
     url: https://www.intercom.com/help/en/articles/4323904-what-is-a-conversation
 - name: Custom Channel Events
   description: |
-    With the **closed beta** "Custom Channel" integration, you can bring Fin and Intercom capabilities to your own platform via API, enabling powerful custom integrations.
+    With the "Custom Channel" integration, you can bring Fin and Intercom capabilities to your own platform via API, enabling powerful custom integrations.
 
     Intercom treats your integration like any other Intercom channel, allowing your application and Intercom to exchange events seamlessly. This makes it possible, for example, for your users to interact with Fin directly within your own application’s UI.
 
-    > **Note:** If you are interested in joining our closed beta and have a use case to integrate with "Fin over API", please reach out to your account manager or our support team for further information.
+    > **Note:** "Fin over API" is currently under managed availability. Please reach out to your accounts team to discuss access and tailored, hands-on support.
 - name: Custom Object Instances
   description: |
     Everything about your Custom Object instances.