How about another language?

Sorry but that is just nonsense.
Apple documents on Swift and Objective-C APIs have been updated continously and with Swift they are still changing many things with APIs getting deprecated all the time. Still they update documents properly.

Do you seriously believe that millions of lines of code can be mantained by any programmer without having reference documents of everything that exists in the APIs written over the years? Any software house must have those internally otherwise there is no chance for programmers to synch their work and remember everything.