[tracker] Clarify SPARQL example in manpage

[Sam Thursfield <sthursfield src gnome org>]

commit 0d7cd900549c781ac1991ac3ccf7a39d79e1df8d
Author: Sam Thursfield <sam afuera me uk>
Date:   Thu Jul 14 02:32:19 2016 +0100

    Clarify SPARQL example in manpage
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767246

 docs/manpages/tracker-sparql.1 |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/manpages/tracker-sparql.1 b/docs/manpages/tracker-sparql.1
index f2f7548..cf60f9f 100644
--- a/docs/manpages/tracker-sparql.1
+++ b/docs/manpages/tracker-sparql.1
@@ -283,11 +283,11 @@ $ tracker sparql -q "SELECT ?song WHERE { ?song a nmm:MusicPiece }"
 .fi
 
 .TP
-List all music albums
+List all music albums, showing title, track count, and length in seconds.
 
 .BR
 .nf
-$ tracker sparql -q "SELECT ?album ?title COUNT(?song)
+$ tracker sparql -q "SELECT ?title COUNT(?song)
                      AS songs
                      SUM(?length) AS totallength
                      WHERE {