Porting my JS45 code to ESR52

I have a working application embedding SpiderMonkey ESR45.  I am working 
on updating it to ESR52.

What I'm discovering is that the API documentation is out of date. For 
instance JS_ReportError is apparently removed from the API, and if I 
look in the headers, it's replaced by a bunch of character-set-specific 
JS_ReportError functions (JS_ReportErrorASCII, JS_ReportErrorUTF8, etc).

But there's no documentation on any of the new functions.

Am I looking the wrong place for documentation, or is the documentation 
available on line simply not going to be updated?