Calling the `account validator exit` will eventually lead the user to this dead link: https://lighthouse-book.sigmaprime.io/voluntary-exit.html . The link should be updated to https://lighthouse-book.sigmaprime.io/validator_voluntary_exit.html . Found in https://github.com/search?q=repo%3Asigp%2Flighthouse%20https%3A%2F%2Flighthouse-book.sigmaprime.io%2Fvoluntary-exit.html&type=code User cannot find the phrase required to complete the voluntary exit by browsing to this dead link.