Fix typo

Author: ericwbailey

partials/section.embedded.hbs

@@ -6,7 +6,7 @@
   <h3 id="subsection-image">Image</h3>
   <img
     src="http://placehold.it/600x400?text=Image+Example"
-    alt="Image Exmaple" />
+    alt="Image Example" />
   <!-- End of #subsection-image -->
 
   <!-- Start of #subsection-broken-image -->