Fix example that rejects promises from in parallel

Closes #10535.

Author: domenic

source

@@ -1634,14 +1634,17 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
    <p>The following solution suffers from race conditions:</p>
 
    <ol>
-    <li><p>Let <var>p</var> be a new promise.</p></li>
+    <li><p>Let <var>p</var> be a new promise created in <span>this</span>'s <span
+    data-x="concept-relevant-realm">relevant realm</span>.</p></li>
 
     <li>
      <p>Run the following steps <span>in parallel</span>:</p>
 
      <ol>
       <li><p>If <var>nameList</var> <span data-x="list contains">contains</span> <var>name</var>,
-      reject <var>p</var> with a <code>TypeError</code> and abort these steps.</p></li>
+      then <span>queue a global task</span> on the <span>DOM manipulation task source</span> given
+      <span>this</span>'s <span>relevant global object</span> to reject <var>p</var> with a
+      <code>TypeError</code>, and abort these steps.</p></li>
 
       <li><p>Do some potentially lengthy work.</p></li>
 
@@ -1663,14 +1666,17 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
    <span>starting a new parallel queue</span>, then:</p>
 
    <ol>
-    <li><p>Let <var>p</var> be a new promise.</p></li>
+    <li><p>Let <var>p</var> be a new promise created in <span>this</span>'s <span
+    data-x="concept-relevant-realm">relevant realm</span>.</p></li>
 
     <li>
      <p><mark><span>Enqueue the following steps</span> to <var>nameListQueue</var>:</mark></p>
 
      <ol>
       <li><p>If <var>nameList</var> <span data-x="list contains">contains</span> <var>name</var>,
-      reject <var>p</var> with a <code>TypeError</code> and abort these steps.</p></li>
+      then <span>queue a global task</span> on the <span>DOM manipulation task source</span> given
+      <span>this</span>'s <span>relevant global object</span> to reject <var>p</var> with a
+      <code>TypeError</code>, and abort these steps.</p></li>
 
       <li><p>Do some potentially lengthy work.</p></li>