That's good point. I think we had a talk a while ago about the latest documentation version should be on top of the list. I'll notify World team about this.
Thanks for the feedback. We're working to enhance the search functionality, and this is one of the items on the list of improvements.
How do I use the search-functionality to only search in the current version of the documentation?
A search for "contentreference" and in section "Documentation" returns results from all versions of the documentation and it is hard to find the most relevant/updated page - http://world.episerver.com/Search/?searchQuery=contentreference§ionFilter=Documentation