documentations:

- added comments
- documented marker struct functions

src/BGS/code_3420.c

@@ -626,7 +626,7 @@ void chvilegame_update(Actor *this) {
     local = (ActorLocal_BGS_3420 *)&this->local;
     if (!this->unk16C_4) {
         this->unk16C_4 = TRUE;
-        this->marker->unk30 = &chvilegame_free;
+        this->marker->actorFreeFunc = &chvilegame_free;
         local->game_pieces = vector_new(sizeof(struct vilegame_piece), 0x20);
         local->grumblie_model_bin = assetcache_get(0x3F7);
         local->unkC = 0;