Fix intro section nesting

Author: afs

spec/index.html

@@ -357,10 +357,11 @@ <h2>Abstract</h2>
         <a href="https://www.w3.org/groups/wg/rdf-star">RDF Star Working Group</a> as part of the
         update of specifications for format and errata.
       </p>
-    </section>
 
-    <section id="related" data-include="common/sparql-related.html"></section>
+      <section id="related" data-include="common/sparql-related.html"></section>
 
+    </section>
+
 <!-- BODY -->
     <section id="introduction">
   <h2>Introduction</h2>