Fix broken [OPENSEARCH] spec link

See https://opensearch.org/disambiguation.html for a bit more information on the specification move.

source

@@ -127713,7 +127713,7 @@ INSERT INTERFACES HERE
    <dd><cite><a href="https://wiki.xiph.org/SkeletonHeaders">SkeletonHeaders</a></cite>. Xiph.Org.</dd>
 
    <dt id="refsOPENSEARCH">[OPENSEARCH]</dt>
-   <dd><cite><a href="http://www.opensearch.org/Specifications/OpenSearch/1.1#Autodiscovery_in_HTML.2FXHTML">Autodiscovery in HTML/XHTML</a></cite>. In <cite>OpenSearch 1.1 Draft 4</cite>, Section 4.6.2. OpenSearch.org.</dd>
+   <dd><cite><a href="https://github.com/dewitt/opensearch/blob/master/opensearch-1-1-draft-6.md#autodiscovery-in-htmlxhtml">Autodiscovery in HTML/XHTML</a></cite>. In <cite>OpenSearch 1.1 Draft 6</cite>. GitHub.</dd>
 
    <dt id="refsORIGIN">[ORIGIN]</dt>
    <dd>(Non-normative) <cite><a href="https://www.rfc-editor.org/rfc/rfc6454">The Web Origin Concept</a></cite>, A. Barth. IETF.</dd>