Added missing </script> tag for proper closure

Author: agnawoussama

aspnet/Dialog/how-to.md

@@ -168,6 +168,8 @@ Initialize Footer in Dialog widgets by adding the script section in JsRender as
         <ej:CheckBox ID="check1" runat="server" Text="Dont ask me this again"></ej:CheckBox>
 
     </div>
+
+    </script>
 
 {% endhighlight %}