This might be fine at a smaller company, but as you grow, having people verbalize these things results in slight variations that over time grow into very big inconsistencies.
Setting up MediaWiki and throwing it up on a Linode server costs 20 bucks a month and can be deployed from a Docker image in roughly 15-20 minutes. It can referenced by everyone, anyone can contribute to it with a full audit of changes, and it's easily searchable.
I use it to document technical and non-technical things like company policies, work flow processes, security practices, coding style, pretty much anything. New employees have a standardized on-boarding process that is clearly documented step by step for them to get setup with everything they need to start being productive by their second day of working here.
It's actually fairly low effort to do this and is a lot easier than having a bunch of people have to remember God knows what and when, or forgetting and then having to ask someone else who may have a vague recollection of it.
An authoritative source of knowledge that everyone has access to and anyone can contribute to is worth setting up.