[gtk+] Update GtkCssProvider box-shadow documentation

[Rob Bradford <rbradford src gnome org>]

commit e707eadaf29dc44a28bd1e0d8107ab449a5e0378
Author: Chris Cummins <christopher e cummins intel com>
Date:   Tue Apr 9 11:56:17 2013 +0100

    Update GtkCssProvider box-shadow documentation
    
    Non-inset box-shadows are no longer ignored by the GTK+ theming engine,
    outset shadows are supported.
    
    Signed-off-by: Rob Bradford <rob linux intel com>

 gtk/gtkcssprovider.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index 7512668..6b9b1c7 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -556,8 +556,7 @@
  * The optional blur radius parameter is parsed, but it is currently not rendered by
  * the GTK+ theming engine.
  * The inset parameter defines whether the drop shadow should be rendered inside or outside
- * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
- * non-inset elements are currently ignored.
+ * the box canvas.
  * </para>
  * <para>
  * To set multiple box-shadows on an element, you can specify a comma-separated list