[gtk+] docs: Add GtkDrawingAreaDrawFunc

[Matthias Clasen <matthiasc src gnome org>]

commit 3c5dbc2f174462dbc4796abcd5edc18fcc143a2e
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 18 06:09:46 2016 -0500

    docs: Add GtkDrawingAreaDrawFunc

 docs/reference/gtk/gtk4-sections.txt |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index bf65d4d..2d594aa 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -896,6 +896,7 @@ gtk_drawing_area_get_content_width
 gtk_drawing_area_set_content_width
 gtk_drawing_area_get_content_height
 gtk_drawing_area_set_content_height
+GtkDrawingAreaDrawFunc
 gtk_drawing_area_set_draw_func
 <SUBSECTION Standard>
 GTK_DRAWING_AREA