Fix a small grammar mistake.

[ci skip]

docs/_includes/getting-started/examples.html

@@ -103,7 +103,7 @@
         <img src="../examples/screenshots/dashboard.jpg" alt="">
       </a>
       <h4>Dashboard</h4>
-      <p>Basic structure for a admin dashboard with fixed sidebar and navbar.</p>
+      <p>Basic structure for an admin dashboard with fixed sidebar and navbar.</p>
     </div>
     <div class="clearfix visible-xs"></div>