[gtk+] Range: Remove leftover comment about update policy

[Daniel Boles <dboles src gnome org>]

commit db7ff6d88aa1f6503fdc48a1ae27e803d3fd61c4
Author: Daniel Boles <dboles src gnome org>
Date:   Mon Feb 27 20:04:02 2017 +0000

    Range: Remove leftover comment about update policy
    
    Update policies were removed way back in 2011… in
    commit c43a31ea33fe048fe74cd669418bea58d544ffab

 gtk/gtkrange.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 17b1d90..77f6b52 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -407,9 +407,6 @@ gtk_range_class_init (GtkRangeClass *class)
    * value to the desired number of decimal digits; the default GTK+
    * handler clamps the value based on #GtkRange:round-digits.
    *
-   * It is not possible to use delayed update policies in an overridden
-   * #GtkRange::change-value handler.
-   *
    * Returns: %TRUE to prevent other handlers from being invoked for
    *     the signal, %FALSE to propagate the signal further
    *