Use "queue an element task" properly in script preparation

Previously the task had no specified task source.

Author: domenic

source

@@ -60380,7 +60380,8 @@ o............A....e
      <li><p>Let <var>src</var> be the value of <var>el</var>'s <code
      data-x="attr-script-src">src</code> attribute.</p></li>
 
-     <li><p>If <var>src</var> is the empty string, then <span>queue a task</span> to <span
+     <li><p>If <var>src</var> is the empty string, then <span>queue an element task</span> on the
+     <span>DOM manipulation task source</span> given <var>el</var> to <span
      data-x="concept-event-fire">fire an event</span> named <code data-x="event-error">error</code>
      at <var>el</var>, and return.</p></li>
 
@@ -60390,10 +60391,10 @@ o............A....e
      <li><p><span data-x="parse a url">Parse</span> <var>src</var> relative to <var>el</var>'s
      <span>node document</span>.</p></li>
 
-     <li><p>If the previous step failed, <span>queue a task</span> to <span
-     data-x="concept-event-fire">fire an event</span> named <code data-x="event-error">error</code>
-     at <var>el</var>, and return. Otherwise, let <var>url</var> be the <span>resulting URL
-     record</span>.</p></li>
+     <li><p>If the previous step failed, then <span>queue an element task</span> on the <span>DOM
+     manipulation task source</span> given <var>el</var> to <span data-x="concept-event-fire">fire
+     an event</span> named <code data-x="event-error">error</code> at <var>el</var>, and return.
+     Otherwise, let <var>url</var> be the <span>resulting URL record</span>.</p></li>
 
      <li><p>If <var>el</var> is <span>potentially render-blocking</span>, then <span>block
      rendering</span> on <var>el</var>.</p></li>