Fix typo in new documentation
@@ -67,7 +67,7 @@ would result in track names like::
Messiah, Part II: No.22: Chorus- Behold The Lamb Of God
Athalia, Act I, Scene I: Sinfonia
-whereas with ``index_track`` disabled you'd get::
+whereas with ``index_tracks`` disabled you'd get::
No.1: Sinfony
No.22: Chorus- Behold The Lamb Of God
