[retro-gtk/build-doc: 8/11] cairo-display: Give it some private section documentation

[Adrien Plazas <aplazas src gnome org>]

commit 4ac07d6a0315975d898408afb71b019af970fd20
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Apr 17 15:44:49 2020 +0200

    cairo-display: Give it some private section documentation

 retro-gtk/retro-cairo-display.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/retro-gtk/retro-cairo-display.c b/retro-gtk/retro-cairo-display.c
index 1fbbbcd..76df208 100644
--- a/retro-gtk/retro-cairo-display.c
+++ b/retro-gtk/retro-cairo-display.c
@@ -1,5 +1,13 @@
 // This file is part of retro-gtk. License: GPL-3.0+.
 
+/**
+ * PRIVATE:retro-cairo-display
+ * @short_description: A widget rendering the video output from a core via Cairo
+ * @title: RetroCairoDisplay
+ * @See_also: #RetroGLDisplay
+ * @stability: Private
+ */
+
 #include "retro-cairo-display-private.h"
 
 #include "retro-pixbuf.h"