demo: update sample title

test/data/OSMD_function_test_noteheadShapes.musicxml

@@ -2,7 +2,7 @@
 <!DOCTYPE score-partwise PUBLIC "-//Recordare//DTD MusicXML 3.1 Partwise//EN" "http://www.musicxml.org/dtds/partwise.dtd">
 <score-partwise version="3.1">
   <work>
-    <work-title>OSMD Function Test - Note Head Shapes</work-title>
+    <work-title>OSMD Function Test - Notehead Shapes</work-title>
     </work>
   <identification>
     <encoding>