Update trigger-workflows.mdx

Remove redundant/wrong return in workflows example

Author: Resonious

src/content/docs/workflows/build/trigger-workflows.mdx

@@ -88,8 +88,6 @@ export default {
 			id: instance.id,
 			details: await instance.status(),
 		});
-
-		return Response.json({ result });
 	},
 };
 ```