Editorial: Fix markup in “Initializing a new Document object”

2b93f9e (PR #1776) introduced a minor
markup error (an `ol` nested inside an `ol`). This fixes it.

source

@@ -82312,15 +82312,17 @@ State: <OUTPUT NAME=I>1</OUTPUT> <INPUT VALUE="Increment" TYPE=BUTTON O
       then:</p>
 
       <ol>
-       <li><p>If <var>settingsObject</var> is a <span data-x="secure-context">secure context</span>,
-       then:</p></li>
+       <li>
+        <p>If <var>settingsObject</var> is a <span data-x="secure-context">secure context</span>,
+        then:</p>
 
-       <ol>
-        <li><p>If <var>browsingContext</var> has an <span>opener browsing context</span> and
-        <var>request</var>'s <span data-x="concept-request-client">client</span> is a <span
-        data-x="non-secure-context">non-secure context</span>, then <span data-x="disowned its
-        opener">disown <var>browsingContext</var>'s opener</span>.</p></li>
-       </ol>
+        <ol>
+         <li><p>If <var>browsingContext</var> has an <span>opener browsing context</span> and
+         <var>request</var>'s <span data-x="concept-request-client">client</span> is a <span
+         data-x="non-secure-context">non-secure context</span>, then <span data-x="disowned its
+         opener">disown <var>browsingContext</var>'s opener</span>.</p></li>
+        </ol>
+       </li>
 
        <li><p>Otherwise, set <var>settingsObject</var>'s <span
        data-x="concept-environment-active-service-worker">active service worker</span> to