[gtk] Add missing types to gdk docs

[Matthias Clasen <matthiasc src gnome org>]

commit 1185b0b4471e54c5ad19e9d44187aaf5e3f76f77
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 1 23:22:13 2018 -0400

    Add missing types to gdk docs

 docs/reference/gdk/gdk4.types | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/docs/reference/gdk/gdk4.types b/docs/reference/gdk/gdk4.types
index e8273d8a3d..de343d2abe 100644
--- a/docs/reference/gdk/gdk4.types
+++ b/docs/reference/gdk/gdk4.types
@@ -1,17 +1,26 @@
 gdk_app_launch_context_get_type
+gdk_clipboard_get_type
+gdk_content_deserializer_get_type
+gdk_content_formats_get_type
+gdk_content_serializer_get_type
 gdk_cursor_get_type
 gdk_device_get_type
 gdk_device_pad_get_type
+gdk_device_tool_get_type
 gdk_display_get_type
 gdk_display_manager_get_type
 gdk_drag_context_get_type
+gdk_event_get_type
 gdk_frame_clock_get_type
 gdk_gl_context_get_type
+gdk_gl_texture_get_type
 gdk_keymap_get_type
+gdk_memory_texture_get_type
 gdk_monitor_get_type
+gdk_paintable_get_type
+gdk_rgba_get_type
 gdk_seat_get_type
+gdk_snapshot_get_type
 gdk_surface_get_type
-gdk_content_serializer_get_type
-gdk_content_deserializer_get_type
-gdk_clipboard_get_type
-gdk_content_formats_get_type
+gdk_texture_get_type
+gdk_vulkan_context_get_type