Update index.bs

Co-authored-by: Mattias Buelens <[email protected]>

Author: youennf

index.bs

@@ -2309,7 +2309,7 @@ create them does not matter.
         |chunk1|, « »).
      1. If |canceled2| is false, perform !
         [$ReadableStreamDefaultControllerEnqueue$](|branch2|.[=ReadableStream/[[controller]]=],
-        |chunk2|, undefined).
+        |chunk2|, « »).
      1. Set |reading| to false.
      1. If |readAgain| is true, perform |pullAlgorithm|.