I was looking for a technical writing or documentation-writing stack, but didn't see one. Tips would be appreciated.
Welcome to Writers! Technical writing is on-topic here. I'm not quite sure what you mean by "documentation models", but chances are your questions fit here. Ask away! (Or if you're still not sure, could you add a couple example question titles to your question here so we'll have something more concrete to discuss?)
Your example question is on-topic here at Writers, but the User Experience Stack Exchange might provide an answer more focused on user experience design (though from a brief look at tags and question lists there seems to be a very heavy focus on interactive media/human-computer interface). It might be worthwhile to ask this question on their Meta.