fix (docs): remove duplicate code in useAssistant example (#2114)

content/examples/01-next-app/06-assistants/02-stream-assistant-responses-with-tools.mdx

@@ -91,18 +91,6 @@ export function Message({ textStream }: { textStream: StreamableValue }) {
 }
 ```
 
-```tsx filename='app/message.tsx'
-'use client';
-
-import { StreamableValue, useStreamableValue } from 'ai/rsc';
-
-export function Message({ textStream }: { textStream: StreamableValue }) {
-  const [text] = useStreamableValue(textStream);
-
-  return <div>{text}</div>;
-}
-```
-
 ## Server
 
 In your server action, you will create a function called `submitMessage` that adds the user's message to the thread. The function will create a new thread if one does not exist and add the user's message to the thread. If a thread already exists, the function will add the user's message to the existing thread. The function will then create a run and stream the assistant's response to the client. Furthermore, the run queue is used to manage multiple runs in the same thread during the lifetime of the server action.