[gtk] docs: Add GtkNative to types

[Matthias Clasen <matthiasc src gnome org>]

commit 3fcd39f659d45bf4013e122fc765ef1de75f66ef
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Sep 24 11:38:35 2019 -0400

    docs: Add GtkNative to types
    
    This is needed to make doc generation work
    for GtkNative.

 docs/reference/gtk/gtk4.types.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index a03901d769..23e796d637 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -123,6 +123,7 @@ gtk_menu_tool_button_get_type
 gtk_message_dialog_get_type
 gtk_model_button_get_type
 gtk_mount_operation_get_type
+gtk_native_get_type
 gtk_notebook_get_type
 gtk_notebook_page_get_type
 gtk_orientable_get_type