ai-transport: add message per response doc

src/data/nav/aitransport.ts

@@ -21,6 +21,10 @@ export default {
     {
       name: 'Token streaming',
       pages: [
+        {
+          name: 'Message per response',
+          link: '/docs/ai-transport/features/token-streaming/message-per-response',
+        },
         {
           name: 'Message per token',
           link: '/docs/ai-transport/features/token-streaming/message-per-token',