Fix return in preload script steps (#802)

index.bs

@@ -7548,7 +7548,7 @@ To <dfn export>run WebDriver BiDi preload scripts</dfn> given |environment setti
 
        1. Let |navigable id| be |navigable|’s [=navigable/top-level traversable=]'s id.
 
-       1. If <code>contexts</code> does not [=list/contains|contain=] |navigable id|, return.
+       1. If |preload script|'s <code>contexts</code> does not [=list/contains|contain=] |navigable id|, continue.
 
     1. If |preload script|'s <code>sandbox</code> is not null, let |realm| be [=get
        or create a sandbox realm=] with |preload script|'s <code>sandbox</code> and