Fixed page-account example

The pagid helper no longer prepend page- prefix.

content/rails/design.md

@@ -56,6 +56,6 @@ Each layout should have its own layout namespace attached to the layout file its
 Use the `pagid` Ruby helper at the top of your action file.
 For example, to assign the page namespace `page-account` to the `/accounts/index.html.erb` view file, place the following string at the top of the view file.
 
-    <% pagid "account" %>
+    <% pagid "page-account" %>
 
     ... here your HTML view