a link in the admin screen to the knowledge base regarding theServer Base Url change returns no result

When logged as administrator in confluence (3.3.3 evaluation version) and editing the general configuration
URL = http://localhost:8080/confluence/admin/editgeneralconfig.action
then on the top of "Server Base Url" appears a warning
Warning: The Server Base URL must be set to the same URL by which browsers will be viewing your Confluence site. See Knowledge Base
the URL of the "knowledge base" link is
http://docs.atlassian.com/confluence/docs-33/display/CONFKB/Various+issues+Caused+when+Server+Base+URL+does+not+Match+the+URL+used+to+access+Confluence
which happens to find nothing

Change the link to get the appropriate support page.