Libdoc: Remove named args info from HTML.
It was already removed from model so HTML always showed that named
args wouldn't be supported. Removing this info was covered by
<table class="metadata">
{{if version}}<tr><th>Library version:</th><td>${version}</td></tr>{{/if}}
{{if scope}}<tr><th>Library scope:</th><td>${scope}</td></tr>{{/if}}
- <tr><th>Named arguments:</th><td>{{if named_args}}supported{{else}}not supported{{/if}}</td></tr>
</table>
<div id="introduction-container">
<h2 id="Introduction">Introduction</h2>
