I've documented our stack and how things are connected but I've found it difficult to promote employee contributions. How do you incentivize contributions to documentation?
I'll be honest it takes a bit of prodding at first and it's hard to do after the fact. I have found that it helps to ask for input from day one. For example if a user is setting up a dev environment for the first time set them up with your setup doc and tell them to take notes about any issues they have or things that should be clarified. The biggest incentive is knowing that your organization values employee feedback and will be receptive to changes they suggest.