A corporate wiki is the easiest and simplest form of corporate documentation you can have. If you really want proper, up-to-date, well-written documentation, a wiki isn't for you. A wiki is the first step towards proper documentation just above the "no documentation" stage.
If you want to improve on the wild-and-easy stage of everyone just using the wiki however they feel like, just have some rules.
For devops work, have a page for all your objects. Track lifetime events (the non-automatic kind) there. Swapped yet another disk in machine b47f8? You'll see the record in the wiki and can maybe also swap the controller or cables. Looking for the local installation procedure of some software? look at the wiki page. Doing another installation on a different host group? put a link in the wiki from hostgroup to software and vice versa. Have page templates for all objects and tasks.
The trick is "no change without wiki change". "No identical second support answer without wiki FAQ entry". The trick is documentation discipline.
(I know that some tasks may be better served with e.g. proper inventory software, however, there is something to be said for everything documentation-like in one place).
Oh, and ffs, never delete history, it will definitely bite you someday.