//en.wikipedia.org/wiki/Wikipedia:VisualEditor/User_guide https://www.mediawiki.org/wiki/Help:VisualEditor/User_guide is out of date in a few places, both text and screenshots
https://en.wikipedia.org/wiki/Wikipedia:VisualEditor/User_guide is also an out of date version of the above that probably needs redirecting
The 'real' User Guide is at https://www.mediawiki.org/wiki/Help:VisualEditor/User_guide
enwiki's copy is usually somewhat out of date. The most out-of-date section is citations. We have three different setups for the Cite button (with nothing/with citation templates/with the citoid service), so writing that section in the central version is a bit of a Choose Your Own Adventure game. (If the button produces a dropdown menu that looks like this, then go here. If the button produces a dialog that looks like this, then go there...)
Shouldn't we remove all these local wiki help pages and redirect everything to MediaWiki wiki?
I don't think there's a plan for that ATM. OTOH, it would be way more efficient to involve more community members to get this going somewhere.
You mean having people who help to create/update the documentation ? AFAK, it never happens (but I'm still young :þ)
As a general principle, I think WMF Product teams should be responsible of keeping the documentation about their projects up to date in mediawiki.org. They should not be responsible of related documentation in wiki projects.
I took a quick look at this user guide, and didn't find anything that was out of date. If there's something specific that's out of date, please point it out and I can take another look.