[gtk: 1/2] Update migrating-3to4.xml

[Matthias Clasen <matthiasc src gnome org>]

commit 3cbb3dc0f4246a051b947840c76f41a645361848
Author: J Arun Mani <j arunmani protonmail com>
Date:   Fri Feb 7 18:30:42 2020 +0000

    Update migrating-3to4.xml

 docs/reference/gtk/migrating-3to4.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/reference/gtk/migrating-3to4.xml b/docs/reference/gtk/migrating-3to4.xml
index 294c404d69..9bb310534b 100644
--- a/docs/reference/gtk/migrating-3to4.xml
+++ b/docs/reference/gtk/migrating-3to4.xml
@@ -374,7 +374,7 @@
     </section>
 
     <section>
-      <title>Adapt to GtkButton API changes</title>
+      <title>Adapt to GtkBox API changes</title>
       <para>
         GtkBox no longer has pack-start and -end. Pack your widgets in the 
         correct order, or reorder them as necessary.