[gnome-panel] docs: include GpImageMenuItem documentation

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 9f0bf71f410eda7439da7298fc23f02a5bdc7120
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Apr 3 03:13:04 2020 +0300

    docs: include GpImageMenuItem documentation

 docs/reference/libgnome-panel/Makefile.am | 1 -
 libgnome-panel/gp-image-menu-item.h       | 7 +++++++
 2 files changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/docs/reference/libgnome-panel/Makefile.am b/docs/reference/libgnome-panel/Makefile.am
index 0e942da0c..d5f973cb3 100644
--- a/docs/reference/libgnome-panel/Makefile.am
+++ b/docs/reference/libgnome-panel/Makefile.am
@@ -51,7 +51,6 @@ IGNORE_HFILES = \
        gp-applet-info-private.h \
        gp-applet-private.h \
        gp-enum-types.h \
-       gp-image-menu-item.h \
        gp-initial-setup-dialog-private.h \
        gp-initial-setup-dialog.h \
        gp-module-private.h \
diff --git a/libgnome-panel/gp-image-menu-item.h b/libgnome-panel/gp-image-menu-item.h
index e953b5dc7..73a9c3af8 100644
--- a/libgnome-panel/gp-image-menu-item.h
+++ b/libgnome-panel/gp-image-menu-item.h
@@ -26,10 +26,17 @@ G_BEGIN_DECLS
 G_DECLARE_DERIVABLE_TYPE (GpImageMenuItem, gp_image_menu_item,
                           GP, IMAGE_MENU_ITEM, GtkMenuItem)
 
+/**
+ * GpImageMenuItemClass:
+ * @parent_class: The parent class.
+ *
+ * The class structure for the #GpImageMenuItem class.
+ */
 struct _GpImageMenuItemClass
 {
   GtkMenuItemClass parent_class;
 
+  /*< private >*/
   gpointer         padding[10];
 };