[gtk+] Remove some outdated information

[Matthias Clasen <matthiasc src gnome org>]

commit e474e9e2749e497c2e3b562ecd59e731e0020c7b
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 20 11:21:05 2017 +0200

    Remove some outdated information
    
    Render nodes don't have transformations, currently.
    Only transform nodes do.

 gsk/gskrendernode.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/gsk/gskrendernode.c b/gsk/gskrendernode.c
index 53a2363..4e4c31b 100644
--- a/gsk/gskrendernode.c
+++ b/gsk/gskrendernode.c
@@ -28,10 +28,7 @@
  * children nodes.
  *
  * Each node has an associated drawing surface, which has the size of
- * the rectangle set using gsk_render_node_set_bounds(). Nodes have an
- * associated transformation matrix, which is used to position and
- * transform the node on the scene graph; additionally, they also have
- * a child transformation matrix, which will be applied to each child.
+ * the rectangle set using gsk_render_node_set_bounds().
  *
  * Render nodes are meant to be transient; once they have been associated
  * to a #GskRenderer it's safe to release any reference you have on them.