[gdk-pixbuf] Update docs for GDK_PIXBUF_FORMAT_THREADSAFE

[Matthias Clasen <matthiasc src gnome org>]

commit 984ec9999c2e632541f2fdeac24d759f1613f822
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 3 07:55:55 2013 -0500

    Update docs for GDK_PIXBUF_FORMAT_THREADSAFE
    
    It is mandatory now.

 gdk-pixbuf/gdk-pixbuf-io.h |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/gdk-pixbuf/gdk-pixbuf-io.h b/gdk-pixbuf/gdk-pixbuf-io.h
index 3d151dd..e1908c7 100644
--- a/gdk-pixbuf/gdk-pixbuf-io.h
+++ b/gdk-pixbuf/gdk-pixbuf-io.h
@@ -291,9 +291,8 @@ gboolean gdk_pixbuf_set_option  (GdkPixbuf   *pixbuf,
  * GdkPixbufFormatFlags:
  * @GDK_PIXBUF_FORMAT_WRITABLE: the module can write out images in the format.
  * @GDK_PIXBUF_FORMAT_SCALABLE: the image format is scalable
- * @GDK_PIXBUF_FORMAT_THREADSAFE: the module is threadsafe. If this flag is not
- *  set, &gdk-pixbuf; will use a lock to prevent multiple threads from using
- *  this module at the same time. (Since 2.6)
+ * @GDK_PIXBUF_FORMAT_THREADSAFE: the module is threadsafe. &gdk-pixbuf;
+ *     ignores modules that are not marked as threadsafe. (Since 2.28).
  * 
  * Flags which allow a module to specify further details about the supported
  * operations.