Editorial: Linkify WritableStreamDealWithRejection

One use of WritableStreamDefaultDealWithRejection was not linkified. Fix
it.

Author: ricea

index.bs

@@ -4425,7 +4425,7 @@ the {{WritableStream}}'s public API.
   1. [=Reject=] |stream|.[=WritableStream/[[pendingAbortRequest]]=]'s [=pending abort
      request/promise=] with |error|.
   1. Set |stream|.[=WritableStream/[[pendingAbortRequest]]=] to undefined.
- 1. Perform ! WritableStreamDealWithRejection(|stream|, |error|).
+ 1. Perform ! [$WritableStreamDealWithRejection$](|stream|, |error|).
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