chore: tidy up index.html (#144)

Author: github-actions[bot]

index.html

@@ -359,8 +359,8 @@ <h2>
       <p>
         This specification defines a [=policy-controlled feature=] identified
         by the string <dfn class="permission">"digital-credentials-get"</dfn>.
-        Its [=policy-controlled feature/default allowlist=] is
-        [=default allowlist/'self'=].
+        Its [=policy-controlled feature/default allowlist=] is [=default
+        allowlist/'self'=].
       </p>
     </section>
     <h2 id="protocol-registry">