An option requiring no coding is to make the new user guide the body of a diary, and make the new user guide link point to the diary instead of the current location. That diary could then be bumped regularly [or simply after any major edit] to appear at the top of the recent diary list. If a major revision is needed and the existing comments are stale, a new diary could be created and the new user guide link pointed to the new diary.

Can the last politician to go out the revolving door please turn the lights off?