[retro-gtk] retro-core-view: Update retro_core_view_set_pixbuf() docs

[Adrien Plazas <aplazas src gnome org>]

commit 4b3cc26bd5c8395cc485e00f48a5f66176de46bd
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Wed Aug 14 13:59:15 2019 +0500

    retro-core-view: Update retro_core_view_set_pixbuf() docs
    
    Reflect the changes in RetroGLDisplay and RetroCairoDisplay in the last two
    commits.

 retro-gtk/retro-core-view.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/retro-gtk/retro-core-view.c b/retro-gtk/retro-core-view.c
index 2866082..682c9f9 100644
--- a/retro-gtk/retro-core-view.c
+++ b/retro-gtk/retro-core-view.c
@@ -537,6 +537,9 @@ retro_core_view_set_core (RetroCoreView *self,
  * @pixbuf: a #GdkPixbuf
  *
  * Sets @pixbuf as the currently displayed video frame.
+ *
+ * retro_pixbuf_set_aspect_ratio() can be used to specify the aspect ratio for
+ * the pixbuf. Otherwise the core's aspect ratio will be used.
  */
 void
 retro_core_view_set_pixbuf (RetroCoreView *self,