While doing the search in [1], I spotted several places where the comments for the function prototypes are obsoleted. For instance, btree_desc() and btree_identify() are now located in nbtdesc.c but the comment in nbtxlog.h is still claiming they are in nbtxlog.c.
Fix these places with the attached. With high possibility there are other places with this kind of obsoleted comments, but I don't know how to find them all :-(.
