[gtk+] Correct Since: tag for gtk-application-prefer-dark-theme

[Matthias Clasen <matthiasc src gnome org>]

commit 939d6eabfa7475fd9d20f5648524a6f945df915c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Feb 26 20:48:34 2012 -0500

    Correct Since: tag for gtk-application-prefer-dark-theme
    
    This setting was available since 2.90.x, so give it a 3.0 tag.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=670832

 gtk/gtksettings.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtksettings.c b/gtk/gtksettings.c
index 34dc38c..fe81204 100644
--- a/gtk/gtksettings.c
+++ b/gtk/gtksettings.c
@@ -1171,7 +1171,7 @@ gtk_settings_class_init (GtkSettingsClass *class)
    * Dark themes should not be used for documents, where large spaces are white/light
    * and the dark chrome creates too much contrast (web browser, text editor...).
    *
-   * Since: 2.22
+   * Since: 3.0
    */
   result = settings_install_property_parser (class,
                                              g_param_spec_boolean ("gtk-application-prefer-dark-theme",