I think datasheets for components are often pretty great. At least the old ones with good application information and all that.

Then again, for a modern MCU or something there’s several books worth of information, so it won’t be on one document any more.

“Do not dangle the mouse by the cord or throw at co-workers.”

“All parts of the computer should fit together easily and without force. By all means, do not use a hammer!”

But seriously, some old UNIX workstation and server manuals come to mind as there’s no mention of Microsoft anywhere. Just a good description of how the computer is actually supposed to be used.

Also home computer manuals and some hifi and lab equipment manuals which came with full schematics and measurement and calibration procedures. They essentially gave all users the maintenance manual and not just the dumb user one.