[gnome-panel] libgnome-panel: add missing documentation

[Alberts Muktupāvels <muktupavels src gnome org>]

commit b73462789f31b14eec9d000e4fceb9874cc5a17f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Apr 3 04:36:21 2020 +0300

    libgnome-panel: add missing documentation

 libgnome-panel/gp-image-menu-item.c | 7 +++++++
 libgnome-panel/gp-image-menu-item.h | 5 +++++
 2 files changed, 12 insertions(+)
---
diff --git a/libgnome-panel/gp-image-menu-item.c b/libgnome-panel/gp-image-menu-item.c
index e2603c3a8..051ce9929 100644
--- a/libgnome-panel/gp-image-menu-item.c
+++ b/libgnome-panel/gp-image-menu-item.c
@@ -24,6 +24,13 @@
  * A #GpImageMenuItem is a menu item which has an icon next to the text label.
  */
 
+/**
+ * GpImageMenuItem:
+ *
+ * #GpImageMenuItem is an opaque data structure and can only be accessed using
+ * the following functions.
+ */
+
 #include "config.h"
 #include "gp-image-menu-item.h"
 
diff --git a/libgnome-panel/gp-image-menu-item.h b/libgnome-panel/gp-image-menu-item.h
index 73a9c3af8..5d73a9d29 100644
--- a/libgnome-panel/gp-image-menu-item.h
+++ b/libgnome-panel/gp-image-menu-item.h
@@ -22,6 +22,11 @@
 
 G_BEGIN_DECLS
 
+/**
+ * GP_TYPE_IMAGE_MENU_ITEM:
+ *
+ * The type for GpImageMenuItem.
+ */
 #define GP_TYPE_IMAGE_MENU_ITEM (gp_image_menu_item_get_type ())
 G_DECLARE_DERIVABLE_TYPE (GpImageMenuItem, gp_image_menu_item,
                           GP, IMAGE_MENU_ITEM, GtkMenuItem)