Update index.bs

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

Author: youennf

index.bs

@@ -6634,7 +6634,7 @@ The following abstract operations are a grab-bag of utilities.
     1. Let |deserialized| be ! [$StructuredDeserializeWithTransfer$](|serialized|,
        [=the current Realm=]).
     1. return |deserialized|.\[[Deserialized]].
- 1. return [$StructuredClone$](|value|).
+ 1. Return [$StructuredClone$](|value|).
 </div>
 
 <h2 id="other-specs">Using streams in other specifications</h2>