Update sample3.cshtml (#5074)

aspnet/mvc/overview/getting-started/introduction/adding-a-view/samples/sample3.cshtml

@@ -25,7 +25,6 @@
                     <li>@Html.ActionLink("About", "About", "Home")</li>
                     <li>@Html.ActionLink("Contact", "Contact", "Home")</li>
                 </ul>
-                @Html.Partial("_LoginPartial")
             </div>
         </div>
     </div>
@@ -41,4 +40,4 @@
     @Scripts.Render("~/bundles/bootstrap")
     @RenderSection("scripts", required: false)
 </body>
-</html>
+</html>