docs: document the GtkUpdateType enum.

Add documentation based on the description from gtk_range_set_update_policy()

diff --git a/docs/reference/gtk/tmpl/gtkenums.sgml b/docs/reference/gtk/tmpl/gtkenums.sgml
index ec4c89bc5d1784753a863f5b1510bf299ddf9a6d..3b72290bd41f733052b8eb27410375d81de4ebc2 100644 (file)
--- a/docs/reference/gtk/tmpl/gtkenums.sgml
+++ b/docs/reference/gtk/tmpl/gtkenums.sgml
@@ -433,12 +433,12 @@ other, rather than vertically stacked
 
 <!-- ##### ENUM GtkUpdateType ##### -->
 <para>
-
+Used by #GtkRange to control the policy for notifying value changes.
 </para>
 
-@GTK_UPDATE_CONTINUOUS: 
-@GTK_UPDATE_DISCONTINUOUS: 
-@GTK_UPDATE_DELAYED: 
+@GTK_UPDATE_CONTINUOUS: Notify updates whenever the value changed
+@GTK_UPDATE_DISCONTINUOUS: Notify updates when the mouse button has been released
+@GTK_UPDATE_DELAYED: Space out updates with a small timeout
 
 <!-- ##### ENUM GtkVisibility ##### -->
 <para>