Replace stray colon with period

Author: apasel422

index.bs

@@ -3932,7 +3932,7 @@ To <dfn>create [=aggregatable contributions=]</dfn> given an [=attribution sourc
         |source|, |triggerData|'s [=aggregatable trigger data/filters=],
         |triggerData|'s [=aggregatable trigger data/negated filters=], and
         |trigger|'s [=attribution trigger/trigger time=]
-        is false, [=iteration/continue=]:
+        is false, [=iteration/continue=].
     1. [=set/iterate|For each=] |sourceKey| of |triggerData|'s [=aggregatable trigger data/source keys=]:
         1. If |aggregationKeys|[|sourceKey|] does not [=map/exist=], [=iteration/continue=].
         1. [=map/Set=] |aggregationKeys|[|sourceKey|] to |aggregationKeys|[|sourceKey|] bitwise-OR |triggerData|'s