docs: Move the GSocketListener SECTION

Move it to the struct docs.

Signed-off-by: Philip Withnall <philip@tecnocode.co.uk>

Helps: #3037

gio/gsocketlistener.c

@@ -42,26 +42,23 @@
 
 
 /**
- * SECTION:gsocketlistener
- * @title: GSocketListener
- * @short_description: Helper for accepting network client connections
- * @include: gio/gio.h
- * @see_also: #GThreadedSocketService, #GSocketService.
+ * GSocketListener:
  *
- * A #GSocketListener is an object that keeps track of a set
+ * A `GSocketListener` is an object that keeps track of a set
  * of server sockets and helps you accept sockets from any of the
  * socket, either sync or async.
  *
- * Add addresses and ports to listen on using g_socket_listener_add_address()
- * and g_socket_listener_add_inet_port(). These will be listened on until
- * g_socket_listener_close() is called. Dropping your final reference to the
- * #GSocketListener will not cause g_socket_listener_close() to be called
- * implicitly, as some references to the #GSocketListener may be held
+ * Add addresses and ports to listen on using
+ * [method@Gio.SocketListener.add_address] and
+ * [method@Gio.SocketListener.add_inet_port]. These will be listened on until
+ * [method@Gio.SocketListener.close] is called. Dropping your final reference to
+ * the `GSocketListener` will not cause [method@Gio.SocketListener.close] to be
+ * called implicitly, as some references to the `GSocketListener` may be held
  * internally.
  *
- * If you want to implement a network server, also look at #GSocketService
- * and #GThreadedSocketService which are subclasses of #GSocketListener
- * that make this even easier.
+ * If you want to implement a network server, also look at
+ * [class@Gio.SocketService] and [class@Gio.ThreadedSocketService] which are
+ * subclasses of `GSocketListener` that make this even easier.
  *
  * Since: 2.22
  */