docs: Fix a heading gotcha

One of the many migration guide sections was too
prominent.

diff --git a/docs/reference/gtk/migrating-3to4.md b/docs/reference/gtk/migrating-3to4.md
index 9942b46048d04ee478d0e2a41c708afdc7408cc2..3d2fa1638bfc95ce18ccfb606dd2648a98a7780a 100644 (file)
--- a/docs/reference/gtk/migrating-3to4.md
+++ b/docs/reference/gtk/migrating-3to4.md
@@ -522,7 +522,7 @@ option. You should always review the resulting changes.
 The <requires> tag now supports for the 'lib' attribute the
 'gtk' value only, instead of the 'gtk+' one previously.
 
-## Adapt to GtkBuilder API changes
+### Adapt to GtkBuilder API changes
 
 gtk_builder_connect_signals() no longer exists. Instead, signals are
 always connected automatically. If you need to add user data to your