[gtk/prop-list] docs: Add gtk_expression_watch_unwatch

[Matthias Clasen <matthiasc src gnome org>]

commit f449800315f777212f9c3dd40bf4939b42dd4903
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 18 18:03:28 2019 -0500

    docs: Add gtk_expression_watch_unwatch

 docs/reference/gtk/gtk4-sections.txt | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 519722c512..dd3c0d57d1 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -7791,6 +7791,7 @@ gtk_expression_bind
 gtk_expression_watch_ref
 gtk_expression_watch_unref
 gtk_expression_watch_evaluate
+gtk_expression_watch_unwatch
 gtk_expression_unwatch
 
 <SUBSECTION>