fix wording (elixir-lang#765)

Author: sairam

_layouts/getting-started.html

@@ -29,7 +29,7 @@ <h3 class="widget-title">{{guide.title}}</h3>
   </article><!-- .hfeed -->
 
   <div id="edit-on-github">
-    <span>Something is wrong?</span>
+    <span>Is something wrong?</span>
     <a href="{{ site.github.repository_url }}/edit/master/{{ page.path }}">
       Edit this page on GitHub.
     </a>