(doc help) quick check on C++ vs. scheme

[Graham Percival]

From 11.1.2 Internal music representation
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C++ object: Each music object is represented by a C++ object. For 
technical reasons, different music objects may be represented by 
different C++ object types. For example, a note is Event object, while 
\grace creates a Grace_music object.

We expect that distinctions between different C++ types will disappear 
in the future.
----

IIRC, a few years ago we replaced a bunch of C++ things with scheme.  I 
also doubt that anybody's looked at this chapter in the past few years. 
 Is this data still correct?

Cheers,
- Graham