Language Reference

[Pete]

I'm starting to learn the D language and started reading the 
Language Reference.  Trying some examples, I noted that the 
compilers are flagging some things as deprecated while the 
Language Reference has no indication of this. Main example, the 
cent/ucent data types.  The compiler (ldc2 at 1.39.0) indicated 
cent/ucent as obsolete and to use core.int128.Cent, but I 
couldn't find that in the standard library site (in core)...but 
found std.Int128. Am I missing something? Is the Language 
Reference not being updated or the compilers running way ahead of 
it?

Thanks