The "Chao Doctor" section was replaced from a Sonic Team e-mail Q&A page to a multi page Wiki-like resource for SA1 Chao. I essentially transfererd a lot the documentation from Chao Island (
http://chao.hippotank.com) to be accessible in-game. While making sure to give credit on each page. Though the original Q&A pages archive is still accessible also
For example, if you want to go for a swim evolution, you can look at the Animal Location page to find the map with the most swim types. Very helpful, and makes the Chao stuff actually pretty cool to grind
I would attach pictures, but it looks like shit without the SA1 on-disc images etc