doc file deleted from gh-pages appears when obsolete url is used

This URL goes to the correct html page generated from configuring-web-ui-and-rest-api-security.md:

http://drill.apache.org/docs/configuring-web-console-and-rest-api-security/

This URL goes to the wrong html page generated from an old version of configuring-web-ui-and-rest-api-security.md:

http://drill.apache.org/docs/configuring-web-ui-and-rest-api-security/

I don't know how to access the github files where the problem lives.