documentations:

- added comments
- documented marker struct functions

src/RBB/code_CA0.c

@@ -200,7 +200,7 @@ void func_80387890(Actor *this){
 void func_803878B0(Actor *this){
     if(!this->unk16C_4){
         this->unk16C_4 = 1;
-        this->marker->unk30 = func_80387890;
+        this->marker->actorFreeFunc = func_80387890;
         marker_setCollisionScripts(this->marker, 0, func_80387850, 0);
         func_8032AA58(this, 1.1f);
         func_8038756C(this, 1);