The Dwarf Fortress wiki https://dwarffortresswiki.org is perhaps the most impressive I've seen, as it maintains namespaces to maintain (and update!) information about particular versions, because many players end up staying on a version for various reasons.
The good ol' Mediawiki look of the DF wiki reminds me of the underrated, and oft maligned Dungeon Crawl Stone Soup wiki: http://crawl.chaosforge.org/Crawl_Wiki
Could you say a bit more about that? Normally I think "have to support people stuck on old versions" is something that happens when you're selling enterprise software to insurance companies. This is the first I've heard of it in games.
I wish the Minecraft wiki did that. I don't tend to play the latest version because I feel like it got overly complex and I get analysis paralysis if I play the latest version.
But being on an old version makes navigating the wiki hard. I'm never sure if some content applies to me. Sometimes they say which version a feature was introduced in, but if a mechanic changes, they often just document the latest behavior.