One of the Crawl design philosophies is that it should be possible to play without needing to consult a wiki. E.g. inspecting a monster shows you its spells and their damage ranges, there's a searchable in-game encyclopedia of all items/spells/monsters/etc., there's an extensive in-game manual with things like species skill aptitudes, examining an item tells you exactly what skill level you need to use it optimally, and so on. There's plenty of useful stuff on the wiki, but it's not a priority to update because it's not entirely necessary.