[gegl] buffer: fix docs for gegl_rectangle_subtract

[Øyvind "pippin" Kolås <ok src gnome org>]

commit bf4f0ac288aacc9b910aadafa2bba6efe218beb5
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Aug 4 20:44:38 2019 +0200

    buffer: fix docs for gegl_rectangle_subtract

 gegl/buffer/gegl-rectangle.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gegl/buffer/gegl-rectangle.h b/gegl/buffer/gegl-rectangle.h
index 74f12b0ee..e5734ef34 100644
--- a/gegl/buffer/gegl-rectangle.h
+++ b/gegl/buffer/gegl-rectangle.h
@@ -241,7 +241,7 @@ gboolean    gegl_rectangle_intersect     (GeglRectangle       *dest,
                                           const GeglRectangle *src2);
 
 /**
- * gegl_rectangle_subtract_bounding_box:
+ * gegl_rectangle_subtract:
  * @destination: an array of 4 #GeglRectangle elements
  * @minuend: a #GeglRectangle
  * @subtrahend: a #GeglRectangle