Fix erroneous field reference

index.bs

@@ -1671,7 +1671,7 @@ To <dfn export>process an attribution eligible response</dfn> given a [=suitable
 
 To <dfn>obtain a set of possible trigger states</dfn> given a [=randomized response output configuration=] |config|:
 1. Let |possibleTriggerStates| be a new [=list/is empty|empty=] [=set=].
-1. [=map/iterate|For each=] |triggerData| → |reportWindows| of |config|:
+1. [=map/iterate|For each=] |triggerData| → |reportWindows| of |config|'s [=randomized response output configuration/trigger data map=]:
     1. [=list/For each=] |reportWindow| of |reportWindows|:
         1. Let |state| be a new [=trigger state=] with the items:
             : [=trigger state/trigger data=]