Use proper JavaScript comment. Closes #519

This commit replaces Razor syntax specific comment with default,
line JavaScript comment

src/MusicStore/Views/Shared/_Layout.cshtml

@@ -25,7 +25,7 @@
     <script src="~/Scripts/jquery.signalR-2.0.1.min.js"></script>
     <script src="~/signalr/hubs" type="text/javascript"></script>
     <script>
-        @*To display what's new in the store*@
+        // To display what's new in the store
         $(function () {
             $.connection.hub.logging = true;
             var announcementsHub = $.connection.Announcement;