docs: api: Replace hotdoc specific commands with Doxygen specific commands

lib/wp/global-proxy.h

@@ -14,16 +14,29 @@
 
 G_BEGIN_DECLS
 
-/**
- * WP_TYPE_GLOBAL_PROXY:
+/*!
+ * @memberof WpGlobalProxy
+ *
+ * @brief The [WpGlobalProxy](@ref global_proxy_section)
+ * <a href="https://developer.gnome.org/gobject/stable/gobject-Type-Information.html#GType">
+ * GType</a>
+ *
+ * @code
+ * #define WP_TYPE_GLOBAL_PROXY (wp_global_proxy_get_type ())
+ * @endcode
  *
- * The #WpGlobalProxy #GType
  */
 #define WP_TYPE_GLOBAL_PROXY (wp_global_proxy_get_type ())
 WP_API
 G_DECLARE_DERIVABLE_TYPE (WpGlobalProxy, wp_global_proxy,
                           WP, GLOBAL_PROXY, WpProxy)
 
+/*!
+ * @memberof WpGlobalProxy
+ *
+ * @brief
+ * @em parent_class
+ */
 struct _WpGlobalProxyClass
 {
   WpProxyClass parent_class;