Fix spec build (#1556)

Author: apasel422

index.bs

@@ -34,6 +34,7 @@ spec:html; type:dfn; text:tokenize the features argument
 spec:html; type:dfn; text:update the image data
 spec:html; type:dfn; text:window open steps
 spec:webdriver; type:dfn; text:error
+spec:webdriver; type:dfn; text:success
 </pre>
 <pre class="anchors">
 spec: clear-site-data; type: dfn; urlPrefix: https://w3c.github.io/webappsec-clear-site-data/
@@ -478,6 +479,8 @@ To <dfn>set Attribution Reporting headers</dfn> given a [=request=] |request|:
     : "<code>[=eligibility/event-source-or-trigger=]</code>"
     :: [=list/Append=] "<code>[=eligible key/event-source=]</code>" and
         "<code>[=eligible key/trigger=]</code>" to |keys|.
+
+    </dl>
 1. Let |supportedRegistrars| be the result of [=getting supported registrars=].
 1. If |supportedRegistrars| [=list/is empty=], [=list/empty|clear=] |keys|.
 1. Let |eligibleDict| be the result of [=obtaining a dictionary structured header value=] with