control/libvlc_internal.h: Comment fix.

src/control/libvlc_internal.h

@@ -78,6 +78,7 @@ struct libvlc_media_instance_t
                         avoid any crash */
     struct libvlc_instance_t  *p_libvlc_instance; /* Parent instance */
     libvlc_media_descriptor_t *p_md; /* current media descriptor */
+    libvlc_event_manager_t * p_event_manager;
 };
 
 
@@ -115,7 +116,7 @@ struct libvlc_media_instance_t
  *        ...
  *        libvlc_event_t event;
  *        event.type = libvlc_MyCoolObjectDidSomething;
- *	    event.my_cool_object_did_something.what_it_did = kSomething;
+ *        event.u.my_cool_object_did_something.what_it_did = kSomething;
  *        libvlc_event_send( p_self->p_event_manager, &event );
  * }
  * */