Fix doxygen warnings.

The code seems to run fine, but please TEST THIS.
Revert this if required.

src/NotesLoaderMidi.cpp

@@ -845,9 +845,9 @@ skip_track:
 						// on this row, then make the sustain note shorter so that it doesn't end on 
 						// the same row as the tap note we're about to add.  NoteData cannot handle a 
 						// hold note ending on the same row as a tap note.
-						NoteData::iterator begin, end;
+						NoteData::TrackMap::iterator begin, end;
 						noteData.GetTapNoteRangeInclusive( nnt, MidiCountToNoteRow(count), MidiCountToNoteRow(count), begin, end, true );
-						for( NoteData::iterator iter = begin; iter != end; iter++ )
+						for( NoteData::TrackMap::iterator iter = begin; iter != end; iter++ )
 						{
 //							if( gd == expert  &&  fBeat >= 27*4-2  &&  nnt == green )
 //								LOG->Trace( "shortening hold at %f, length %d", fBeat, length );