From time to time, I have reported to Facebook about errors, bad links, not updated information etc that I seen in their documentation by using their bug tool. So far, I am happy with their response time!
Recently, Facebook has restructured its doc sites again. I have reported some missing items in the updated menu. Though it was initially replied that it was “by design”, I just notice that Facebook has added the items that I suggested!
So, in case you have found anything wrong in the documentation or believe that there is a way to further improve it, report that to Facebook!