LLMs are pretty bad at compressing ideas down to the level a smart human can. I think this is quite important for good documentation. Essentially the AI wont do a good job of highlighting the really important and essential details unless you go in and edit the writing by hand afterwards using your human intuition. I am not saying to not use LLMs to write docs, but I would definitely edit to expose the really important details as early as possible in the docs and leave the bulk boring stuff the LLM writes for later.