If you aren’t sure how a certain feature works, and nobody else in your company knows, and there’s no way to find out one way or the other, here’s a radical idea: just leave that feature out of the documentation. The same goes for product specs that nobody can certify as accurate. Simply put, it’s more damaging to give your customers the wrong information than no information at all. In the former case, you’re basically lying to them, but in the latter, you’re inviting them to ask for clarification and giving yourself a chance to get it right when you respond.