[gtk+] gtk4-sections: Add missing GtkWidget child/sibling accessors

[Timm Bäder <baedert src gnome org>]

commit d5c6692104e1d9a723b02d52283b9dfaac86e699
Author: Timm Bäder <mail baedert org>
Date:   Wed Apr 5 19:58:35 2017 +0200

    gtk4-sections: Add missing GtkWidget child/sibling accessors

 docs/reference/gtk/gtk4-sections.txt |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 5cedb69..df8b221 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -4643,6 +4643,10 @@ gtk_widget_list_action_prefixes
 gtk_widget_get_action_group
 gtk_widget_measure
 gtk_widget_snapshot_child
+gtk_widget_get_next_sibling
+gtk_widget_get_prev_sibling
+gtk_widget_get_first_child
+gtk_widget_get_last_child
 
 <SUBSECTION>
 gtk_widget_get_path