[gtk+] Drop event filters from the docs

[Matthias Clasen <matthiasc src gnome org>]

commit 601c5fd7346d20a4d64cd0d47a6da1d4606e6185
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 7 15:13:31 2018 -0500

    Drop event filters from the docs
    
    No longer public API.

 docs/reference/gdk/gdk4-sections.txt |    5 -----
 1 files changed, 0 insertions(+), 5 deletions(-)
---
diff --git a/docs/reference/gdk/gdk4-sections.txt b/docs/reference/gdk/gdk4-sections.txt
index 0f41547..76c1e16 100644
--- a/docs/reference/gdk/gdk4-sections.txt
+++ b/docs/reference/gdk/gdk4-sections.txt
@@ -258,11 +258,6 @@ gdk_window_set_accept_focus
 gdk_window_get_accept_focus
 gdk_window_set_focus_on_map
 gdk_window_get_focus_on_map
-gdk_window_add_filter
-gdk_window_remove_filter
-GdkFilterFunc
-GdkFilterReturn
-GdkXEvent
 gdk_window_shape_combine_region
 gdk_window_set_child_shapes
 gdk_window_merge_child_shapes