object.h: spelling fix

 * @class_base_init: This function is called for all base classes after all

 *   parent class initialization has occurred, but before the class itself

 *   is initialized.  This is the function to use to undo the effects of

 *   memcpy from the parent class to the descendents.

 *   memcpy from the parent class to the descendants.

 * @class_finalize: This function is called during class destruction and is

 *   meant to release and dynamic parameters allocated by @class_init.

 * @class_data: Data to pass to the @class_init, @class_base_init and