[gegl] docs: fix docs for gegl_buffer_new_for_backend

[Øyvind Kolås <ok src gnome org>]

commit 11f7f789c4dd4b78ae6d307488fc2452135b691c
Author: �yvind Kolås <pippin gimp org>
Date:   Sun Feb 13 21:22:49 2011 +0000

    docs: fix docs for gegl_buffer_new_for_backend

 gegl/buffer/gegl-buffer.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gegl/buffer/gegl-buffer.h b/gegl/buffer/gegl-buffer.h
index 369b0d2..8bf1873 100644
--- a/gegl/buffer/gegl-buffer.h
+++ b/gegl/buffer/gegl-buffer.h
@@ -63,6 +63,7 @@ GeglBuffer*     gegl_buffer_new               (const GeglRectangle *extent,
  * gegl_buffer_new_for_backend:
  * @extent: the geometry of the buffer (origin, width and height) a
  * GeglRectangle.
+ * @backend: an instance of a GeglTileBackend subclass.
  *
  * Create a new GeglBuffer from a backend, if NULL is passed in the extent of
  * the buffer will be inherited from the extent of the backend.