HTMLCollection namedItem not *OptionsCollection

PR #429. Reference the namedItem method from HTMLCollection, not
HTMLOptionsCollection. Cleanup from 834a858

source

@@ -7397,7 +7397,7 @@ http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C%21DOCTYPE%20html%3E..
     from the collection.</p>
    </dd>
 
-   <dt><var>element</var> = <var>collection</var> . <code subdfn data-x="dom-HTMLOptionsCollection-namedItem">namedItem</code>(<var>name</var>)</dt>
+   <dt><var>element</var> = <var>collection</var> . <code subdfn data-x="dom-HTMLCollection-namedItem">namedItem</code>(<var>name</var>)</dt>
    <dt><var>element</var> = <var>collection</var>[<var>name</var>]</dt>
    <dd>
     <p>Returns the item with <span data-x="concept-id">ID</span> or <code data-x="attr-option-name">name</code> <var>name</var> from the collection.</p>
@@ -50068,7 +50068,7 @@ You cannot submit this form when the field is incorrect.</samp></pre>
   the same argument.</p>
 
   <p>The <dfn><code data-x="dom-select-namedItem">namedItem(<var>name</var>)</code></dfn>
-  method must return the value returned by <span data-x="dom-HTMLOptionsCollection-namedItem">the
+  method must return the value returned by <span data-x="dom-HTMLCollection-namedItem">the
   method of the same name</span> on the <code data-x="dom-select-options">options</code> collection,
   when invoked with the same argument.</p>