[totem] backend: Document the buffering_left struct member

[Bastien Nocera <hadess src gnome org>]

commit 10fba4a5958657cea57a26ebe3311ac86424dd59
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jul 18 16:15:25 2012 +0100

    backend: Document the buffering_left struct member

 src/backend/bacon-video-widget.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/backend/bacon-video-widget.c b/src/backend/bacon-video-widget.c
index f77466a..5bb6ea2 100644
--- a/src/backend/bacon-video-widget.c
+++ b/src/backend/bacon-video-widget.c
@@ -268,7 +268,8 @@ struct BaconVideoWidgetPrivate
   GstElement                  *download_buffering_element;
   char                        *download_filename;
   /* used to compute when the download buffer has gone far
-   * enough to start playback */
+   * enough to start playback, not "amount of buffering time left
+   * to reach 100% fill-level" */
   gint64                       buffering_left;
 
   /* for easy codec installation */