You want to see the most perfect example of how to document process? Get hold of a copy the McDonalds franchise operations manual. It is a genuinely beautiful artefact. There is literally no aspect of running a burger restaurant that isn't in the ops manual; How the parking lot should be managed, how employees should wash their hands, how a hand-cart should be unloaded. Almost every sentence speaks of a lesson learned the hard way, ten thousand little edits because of a lawsuit or a process bottleneck or a QA problem. It's an incredible example of what happens when you take something simple and spend several decades optimising it.