[ghaff]

You basically need to deprecate and eventually probably take offline outdated docs. There's something to be said for the historical record but if it's indexed--and if it's not no one will probably find it--it's going to compete with current documentation for search.

There's no easy answer.

[enraged_camel]

Large organizations in many sectors employ professional records managers for this reason (and many others). Every record has a “lifecycle” and it is deprecated and discarded after that.