[gtk+] gdktypes: Update docs for GDK_GRAB_FAILED

[Matthias Clasen <matthiasc src gnome org>]

commit b18ebbb164a89029f6f25f82da1ddf0d3162469a
Author: Pavel Grunt <pgrunt redhat com>
Date:   Thu Jun 2 15:35:38 2016 +0200

    gdktypes: Update docs for GDK_GRAB_FAILED
    
    Mention in documentation that it is available since 3.16
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767165

 gdk/gdktypes.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdktypes.h b/gdk/gdktypes.h
index 7c4a2bb..48846b8 100644
--- a/gdk/gdktypes.h
+++ b/gdk/gdktypes.h
@@ -337,7 +337,7 @@ typedef enum
  * @GDK_GRAB_NOT_VIEWABLE: the grab window or the @confine_to window are not
  *  viewable.
  * @GDK_GRAB_FROZEN: the resource is frozen by an active grab of another client.
- * @GDK_GRAB_FAILED: the grab failed for some other reason.
+ * @GDK_GRAB_FAILED: the grab failed for some other reason. Since 3.16
  *
  * Returned by gdk_device_grab(), gdk_pointer_grab() and gdk_keyboard_grab() to
  * indicate success or the reason for the failure of the grab attempt.