[wg/fedid] Update OOS

OOS as a `section` as noted here w3c/strategy#450 (comment)

2024/wg-fedid.html

@@ -179,18 +179,20 @@ <h2>Scope</h2>
         <li>Enabling a Federated Identity Model while adhering to <a href="https://www.w3.org/TR/privacy-principles/" rel="nofollow">privacy principles</a> despite the <a href="https://www.w3.org/2001/tag/doc/web-without-3p-cookies/" rel="nofollow">deprecation of third-party cookies</a>, a cornerstone of such operations.</li>
         <li>Enabling a Decentralized Identity Model by invoking a wallet, without <a href="https://github.com/WICG/digital-identities/blob/main/custom-schemes.md" rel="nofollow">custom schemes</a> or privacy-invasive alternative identity and attribute verification systems.</li>
       </ul>
-
-        <p>Specific topics out of scope:</p>
-        <ul class="out-of-scope">
-          <li>Designing new authentication methods.</li>
-          <li>Designing individual credential and assertion formats</li>
-          <li>Performing any security or confidence assessment (e.g. checking signatures,
-            audience, encoding, etc) of the <a
-            href="https://fedidcg.github.io/FedCM/#dom-identityprovidertoken-token">token</a> that
-            encodes the <a href="https://fedidcg.github.io/FedCM/#fetch-identity-assertion">identity
-            assertions</a>.</li>
-          <li>Ad-tech tools or APIs specifically focused on advertising as opposed to authentication.</li>
-        </ul>
+      <section id="section-out-of-scope">
+        <h3 id="out-of-scope">Out of Scope</h3>
+          <p>The following topics are out of scope, and will not be addressed by this Working group.</p>
+          <ul class="out-of-scope">
+            <li>Designing new authentication methods.</li>
+            <li>Designing individual credential and assertion formats</li>
+            <li>Performing any security or confidence assessment (e.g. checking signatures,
+              audience, encoding, etc) of the <a
+              href="https://fedidcg.github.io/FedCM/#dom-identityprovidertoken-token">token</a> that
+              encodes the <a href="https://fedidcg.github.io/FedCM/#fetch-identity-assertion">identity
+              assertions</a>.</li>
+            <li>Ad-tech tools or APIs specifically focused on advertising as opposed to authentication.</li>
+          </ul>
+      </section>
     </section>
     <section id="deliverables">
       <h2>