replaced placeholder of the img attribute value with the path to the git unique image also adding the h2 elemet

Author: Tobias-Amaechina

Wireframe/index.html

@@ -96,8 +96,9 @@ <h2> What is the Purpose of a Wireframe?</h2>
 
         <article>
 
+<img src="git_branch.png" alt="A Git branch diagram" />
+        <h2> What Is a Git Branch?</h2>
 
-          
         </article>
 
     </main>