[gtk/ebassi/doc-fixes: 4/8] docs: Add missing GdkDragSurfaceInterface gtk-doc annotation

[Emmanuele Bassi <ebassi src gnome org>]

commit beb3df09b012a07531e2165309792a94c9565da0
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Dec 2 15:15:30 2020 +0000

    docs: Add missing GdkDragSurfaceInterface gtk-doc annotation

 gdk/gdkdragsurface.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gdk/gdkdragsurface.c b/gdk/gdkdragsurface.c
index 971584c042..5e41b4bbe7 100644
--- a/gdk/gdkdragsurface.c
+++ b/gdk/gdkdragsurface.c
@@ -30,6 +30,12 @@
  * during a DND operation.
  */
 
+/**
+ * GdkDragSurfaceInterface:
+ *
+ * The #GdkDragSurfaceInterface implementation is private to GDK.
+ */
+
 G_DEFINE_INTERFACE (GdkDragSurface, gdk_drag_surface, GDK_TYPE_SURFACE)
 
 static gboolean