docs(nextjs-suspense-streaming): remove unnecessary curly braces (TanStack#6738)

Author: manudeli

examples/react/nextjs-suspense-streaming/src/app/providers.tsx

@@ -23,7 +23,7 @@ export function Providers(props: { children: React.ReactNode }) {
       <ReactQueryStreamedHydration>
         {props.children}
       </ReactQueryStreamedHydration>
-      {<ReactQueryDevtools initialIsOpen={false} />}
+      <ReactQueryDevtools initialIsOpen={false} />
     </QueryClientProvider>
   )
 }