Fix example app

Author: fwang

example/pages/middleware-redirect.js

@@ -4,7 +4,7 @@ export default function Page() {
   return (
     <Layout>
       <article>
-        <h1 className={utilStyles.headingXl}>
+        <h1>
           Middleware - redirect
         </h1>
         <hr />

example/pages/ssg-dynamic-fallback/[id].js

@@ -35,7 +35,7 @@ export default function Post({ data, time }) {
         </p>
         <p>
           <b>Test 2:</b>
-          This string 👉 "{data.title}" should be "First post"
+          This string 👉 "{data && data.title}" should be "First post"
         </p>
         <p>
           <b>Test 3:</b>