Correct latest-invoice.tsx chapter reference (vercel#790)

Author: miguelfdezc

dashboard/starter-example/app/ui/dashboard/latest-invoices.tsx

@@ -14,7 +14,7 @@ export default async function LatestInvoices({
         Latest Invoices
       </h2>
       <div className="flex grow flex-col justify-between rounded-xl bg-gray-50 p-4">
-        {/* NOTE: Uncomment this code in Chapter 9 */}
+        {/* NOTE: Uncomment this code in Chapter 7 */}
 
         {/* <div className="bg-white px-6">
           {latestInvoices.map((invoice, i) => {