Update src/passes/HeapUntangling.cpp

Co-authored-by: Thomas Lively <tlively123@gmail.com>

Author: kripken

src/passes/HeapUntangling.cpp

@@ -255,7 +255,7 @@ struct HeapUntangling : public WalkerPass<PostWalker<HeapUntangling>> {
 
       // Finally, if the initial value of the local from the function entry is
       // used, do not optimize. For a var, that means the default of zero, which
-      // will trap, while for params it means an unknown value. We therefore
+      // will trap when accessed, while for params it means an unknown value. We therefore
       // must always check for params, but for vars, if trapsNeverHappen then we
       // can assume the null is never accessed, and ignore this issue.
       if (func->isParam(localIndex) || !getPassOptions().trapsNeverHappen) {