Fix a comment referring to an old implementation

src/libeis.h

@@ -616,13 +616,18 @@ eis_device_has_capability(struct eis_device *device,
 			  enum eis_device_capability cap);
 
 /**
- * Create a new device with the given name and capabilities on the seat.
- *
- * This device is not immediately active, use eis_device_add() to
- * notify the client of it's availability.
+ * Create a new device on the seat. This device is not immediately active, use
+ * eis_device_add() to notify the client of it's availability.
  *
  * The returned device is refcounted, use eis_device_unref() to drop the
  * reference.
+ *
+ * Before calling eis_device_add(), use the following functions to set up the
+ * device:
+ * - eis_device_configure_name()
+ * - eis_device_configure_capability()
+ * - eis_device_new_region()
+ * - eis_device_new_keymap()
  */
 struct eis_device *
 eis_seat_new_device(struct eis_seat *seat);