Updating docs to a new release is easy unless the documentation system (such as react.dev redesign) or design is rewritten. Some projects seem to do this on a regular basis.
Some documentation generators generate random class names (such as .gtWOdv, .ezMiXD, .gOhcvK on docs.npmjs.com by Gatsby) which makes cleaning the docs from superfluous content (such as on-page navigation) very cumbersome and flaky.
Monthly, we auto-generate a list of outdated docs, here is the latest: https://github.com/freeCodeCamp/devdocs/issues/2105
Help is always welcome. :-)