Fixed regoff_t documentation for wide characters.
Fixed regoff_t documentation for wide characters.

The documentation erroneously claimed that offsets are always given in
bytes (they are bytes in byte and multibyte strings, but wchar_t
offsets in wchar_t strings).

Thanks to Gregory Sharp for pointing this out.

darcs-hash:20070128190845-ced27-d8dc815c564b43ee015f03a03c27324906c90a32.gz

laurikari/tre,amlweems/tre,laurikari/tre,amlweems/tre,laurikari/tre,amlweems/tre