Fix frontpage comment about the Scala Days sponsors banners

Author: anatoliykmetyuk

_layouts/frontpage.html

@@ -16,8 +16,7 @@
         </p>
         <span class="hide"><i class="fa fa-close"></i></span>
       </div>
-      <!-- Uncomment the line below to enable the Scala Days Sponsors banner -->
-      <!-- {% include scala-days-sponsors.html %} -->
+      <!-- Include the following file here to enable the Scala Days sponsors banners: scala-days-sponsors.html -->
       <div class="wrap">
         <!-- Navigation -->
         <nav class="navigation" role="menu">