add header 2 for second article

Author: caro-vh

Wireframe/index.html

@@ -30,7 +30,7 @@ <h2>The purpose of a README file</h2>
     <article>
       <img src="https://static-assets.codecademy.com/Courses/intro-to-ui-and-ux/wireframes/wireframe-elements.jpg"
         alt="wireframe elements" width="700" />
-      <h2></h2>
+      <h2>The Purpose of Wireframes</h2>
       <p>
       </p>
       <a href="">Read more</a>