[gtk] picture: Fix g-i annotation warning

[Rico Tzschichholz <ricotz src gnome org>]

commit b1f934d3b0ab532d92533430a97dfc8b79a8c509
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Jun 13 13:08:28 2018 +0200

    picture: Fix g-i annotation warning

 gtk/gtkpicture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkpicture.c b/gtk/gtkpicture.c
index 3a8970a567..ba49fc03b7 100644
--- a/gtk/gtkpicture.c
+++ b/gtk/gtkpicture.c
@@ -312,7 +312,7 @@ gtk_picture_class_init (GtkPictureClass *class)
                            GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
-   * GtkPicture:paintable:
+   * GtkPicture:file:
    *
    * The #GFile that is displayed or %NULL if none.
    */