Oh wow, sure enough, thanks so much for catching this. I have submitted internal ticket to get this taken care of. I was looking at some of the differences between the user guides, and The differences I saw listed were minor. It is probably best to use the latest document possible, but really you will be safe using any of them. At the very bottom of the user guide it details the changes that have been made over the years.
Firmware version 4.1.0.22 for the PowerConnect 5500 family of switches was released on June 14, 2018. There are several issues with the documentation in this release: Please offer guidance on what documentation should be followed. The firmware itself seems to load and run just fine on my switch with a few hours of burn-in time.
Documentation issues w/PowerConnect 5548 firmware v4.1.0.22