Thank you for reaching out to us, I almost forgot your question here, my apologies. Your screenshot just made me aware that I made a bit of a boo-boo when I cleaned up the forum navigation a few weeks ago and exposed the Categories element only to admins (which is where I shoved all the minor stuff). Thank you for that!
I have fixed that now, and I also added the links you desire there because I see value in them too. But at the same time, I did the clean-up with the goal of making the navigation less"busy". Which is why the documentation links must remain hidden in the Categories item.