Update sample3.cshtml (#3732)

Added Bootstrap table class to the above code snippet that was missing.

aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application/samples/sample3.cshtml

@@ -1,7 +1,7 @@
 <p>
     @Html.ActionLink("Create New", "Create")
 </p>
-<table>
+<table class="table">
     <tr>
         <th>
             @Html.ActionLink("Last Name", "Index", new { sortOrder = ViewBag.NameSortParm })
@@ -14,4 +14,4 @@
         <th></th>
     </tr>
 
-@foreach (var item in Model) {
+@foreach (var item in Model) {