[tracker/functions] Added comment about the Artist field in PDF extractor

[Mikael Ottela <mottela src gnome org>]

commit 4df044c028b51dc32748d79e52e72c35724b6ab5
Author: Philip Van Hoof <philip codeminded be>
Date:   Thu Dec 24 13:48:34 2009 +0100

    Added comment about the Artist field in PDF extractor

 src/tracker-extract/tracker-extract-pdf.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-pdf.c b/src/tracker-extract/tracker-extract-pdf.c
index 44922a9..d6cf53b 100644
--- a/src/tracker-extract/tracker-extract-pdf.c
+++ b/src/tracker-extract/tracker-extract-pdf.c
@@ -359,6 +359,8 @@ extract_pdf (const gchar          *uri,
 			g_free (xd.FocalLength);
 		}
 
+		/* Question: Shouldn't xd.Artist be merged with md.author instead? */
+
 		if (xd.Artist || xd.contributor) {
 			gchar *artist;