[gtk+] ProgressBar: Update node summary per last commit

[Daniel Boles <dboles src gnome org>]

commit 843cd7f22e75c765dd2590886f02b1a3d9642c67
Author: Daniel Boles <dboles src gnome org>
Date:   Tue Apr 25 10:57:55 2017 +0100

    ProgressBar: Update node summary per last commit
    
    The node named "progress" is a child of the node named "trough".

 gtk/gtkprogressbar.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkprogressbar.c b/gtk/gtkprogressbar.c
index 251208b..217384f 100644
--- a/gtk/gtkprogressbar.c
+++ b/gtk/gtkprogressbar.c
@@ -81,12 +81,12 @@
  * ]|
  *
  * GtkProgressBar has a main CSS node with name progressbar and subnodes with
- * names text, trough and progress. The text subnode is only present if text
- * is shown. The progress subnode has the style class .pulse when in activity
- * mode. It gets the style classes .left, .right, .top or .bottom added when
- * the progress 'touches' the corresponding end of the GtkProgressBar.
- * The .osd class on the progressbar node is for use in overlays like the one
- * epiphany has for page loading progress.
+ * names text and trough, of which the latter has a subnode named progress. The
+ * text subnode is only present if text is shown. The progress subnode has the
+ * style class .pulse when in activity mode. It gets the style classes .left,
+ * .right, .top or .bottom added when the progress 'touches' the corresponding
+ * end of the GtkProgressBar. The .osd class on the progressbar node is for use
+ * in overlays like the one Epiphany has for page loading progress.
  */
 
 struct _GtkProgressBarPrivate