[Workers AI] Fix model name typo (#17452)

Author: xqliu

src/content/docs/workers-ai/get-started/workers-wrangler.mdx

@@ -87,7 +87,7 @@ export default {
 } satisfies ExportedHandler<Env>;
 ```
 
-Up to this point, you have created an AI binding for your Worker and configured your Worker to be able to execute the Llama 2 model. You can now test your project locally before you deploy globally.
+Up to this point, you have created an AI binding for your Worker and configured your Worker to be able to execute the Llama 3.1 model. You can now test your project locally before you deploy globally.
 
 ## 4. Develop locally with Wrangler