[gtk+] drawingarea: Clarify docs

[Benjamin Otte <otte src gnome org>]

commit 8b76d12f289ef07ddac30c21f330a977d270c5a7
Author: Benjamin Otte <otte redhat com>
Date:   Wed Oct 19 18:18:31 2016 +0200

    drawingarea: Clarify docs
    
    Don't use gdk_window_invalidate(), use gtk_widget_queue_draw().

 gtk/gtkdrawingarea.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkdrawingarea.c b/gtk/gtkdrawingarea.c
index 999c95c..786cded 100644
--- a/gtk/gtkdrawingarea.c
+++ b/gtk/gtkdrawingarea.c
@@ -102,8 +102,8 @@
  * Draw signals are normally delivered when a drawing area first comes
  * onscreen, or when it’s covered by another window and then uncovered.
  * You can also force an expose event by adding to the “damage region”
- * of the drawing area’s window; gtk_widget_queue_draw_area() and
- * gdk_window_invalidate_rect() are equally good ways to do this.
+ * of the drawing area’s window using gtk_widget_queue_draw_region(),
+ * gtk_widget_queue_draw_area() or gtk_widget_queue_draw().
  * You’ll then get a draw signal for the invalid region.
  *
  * The available routines for drawing are documented on the