Document skip_notifications on the Preview conversation reply schema (#629)

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: VarshSuresh

descriptions/0/api.intercom.io.yaml

@@ -27058,6 +27058,10 @@ components:
           items:
             "$ref": "#/components/schemas/conversation_attachment_files"
           maxItems: 10
+        skip_notifications:
+          type: boolean
+          description: Option to disable notifications when replying to a conversation.
+          example: true
         skip_unsnooze:
           type: boolean
           description: When true, prevents the reply from waking a snoozed conversation.