Does anyone here know where the best place is to report formatting errors in the PDFs?

Does anyone here know where the best place is to report formatting errors in the PDFs? I noticed the margin background on pg. 144 appears to have been dropped between 8.1 and 8.2, and the margin text there also seems to be the lighter shade of 8.1, as opposed to the darker shade it was replaced with in the rest of 8.2. It’s pretty minor, but I figured it’d be worth at least mentioning it to someone.