[gtk] surface: fix up docs

[Matthias Clasen <matthiasc src gnome org>]

commit 71cc68b14bd0011c00aa6fb2664b927258ae4520
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat May 25 20:46:41 2019 +0000

    surface: fix up docs
    
    The docs for gdk_surface_invalidate_region were
    talking about a no-longer-existing argument.

 gdk/gdksurface.c | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/gdk/gdksurface.c b/gdk/gdksurface.c
index 7e95e6a74c..d5ec14ca7f 100644
--- a/gdk/gdksurface.c
+++ b/gdk/gdksurface.c
@@ -1788,11 +1788,6 @@ gdk_surface_queue_expose (GdkSurface *surface)
  * GDK will process all updates whenever the frame clock schedules a redraw,
  * so there’s no need to do forces redraws manually, you just need to
  * invalidate regions that you know should be redrawn.
- *
- * The @invalidate_children parameter controls whether the region of
- * each child surface that intersects @region will also be invalidated.
- * If %FALSE, then the update area for child surfaces will remain
- * unaffected.
  **/
 void
 gdk_surface_invalidate_region (GdkSurface          *surface,