Good question, I do not think I have thoughts on a general procedure, but:
A lot of work has gone into reviewing, streamlining and improving the package during the onboarding. It would seem only consequent to have some procedure for updates as well. For my particular case these are some things that came up:
1.) What is the procedure - onboarding has one so should updating.
2.) If nobody is watching one might get sloppy on documentation - standards that were required for onboarding might erode over time - we are all busy - right? (was News updated, are there examples for all main functions, are vignettes still working / up-to-date, ...)
3.) Implementation details: Although, updates usually do not change that much there might still be little questions some room for discussion, decisions or advise.
This is all that comes to my mind right now.