[gtk+] Fix a duplicate word in the docs

[Matthias Clasen <matthiasc src gnome org>]

commit c201cb3af0e7bae685366c5fb45e01db29e4c507
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 24 20:51:55 2016 -0400

    Fix a duplicate word in the docs

 docs/reference/gtk/migrating-2to3.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/gtk/migrating-2to3.xml b/docs/reference/gtk/migrating-2to3.xml
index 9441955..b0bad87 100644
--- a/docs/reference/gtk/migrating-2to3.xml
+++ b/docs/reference/gtk/migrating-2to3.xml
@@ -1133,7 +1133,7 @@ gtk_arrow_draw (GtkWidget *widget,
       The default values for the #GtkScrolledWindow:hscrollbar-policy and
       #GtkScrolledWindow:vscrollbar-policy properties have been changed from
       'never' to 'automatic'. If your application was relying on the default
-      value, you will have explicitly set it explicitly.
+      value, you will have to set it explicitly.
     </para>
 
     <para>