If anything, I would argue discord tends to improve website-based documentation because people ask the same question over and over again, leading to a need for a quick way to link the answer.
Who do you think is replacing FAQ's with Discord?
I don't know how much of an outlier this is, as said, I didn't ever use it again and that was at least two years ago. But at least here on hn I've read similar stories.
I have seen exactly 1 project ever have a solution to this, and ironically it was actually on Discord. Of all the many many chat applications out there, Discord seems to have the most flexible admin control of retroactive chat organisation, and 1 huge development community I'm in has actually proactively created threads when a reoccurring topic comes up again and then moved them to a common FAQ channel.
When enough people make the same thread to ask the same question, that is a frequently-asked question.