Document in 6.5 https://docs.couchbase.com/server/6.5/install/thp-disable.html
It must show example of before and after disable THP so that user could compare the process. More over, all commands at the end of page to verify THP are the same for all OS. That is not correct.
You could get from this doc for reference https://docs.couchbase.com/server/5.5/install/thp-disable.html