On "Apache HowTo" page ( http://tomcat.apache.org/connectors-doc/webserver_howto/apache.html ) there is a "Workers HowTo" link ( http://tomcat.apache.org/connectors-doc/webserver_howto/workers.html ) which appears to be broken.
Thanks for the report. This has been fixed in svn (r746040) and I have also manually updated the links on the web site. Note that it will take ~1 hour for the changes to sync to the live web server.