This discourse discussion software is self-governing using the trust system. Explaining user trust levels and permissions
That said, the official faq threads could be completely moderated by the trusted members and all posts to the section would have to go through that process.
There’s a bunch of threads on the discourse meta site. Using Discourse as a internal Knowledge Base / Intranet - #23 by Juno - feature - Discourse Meta But, there is no 1 way to do it. Having a nested category in this category that was locked down for example would be one idea.