move anchor out of h2

otherwise, it gets duplicated by respec (in the ToC)

Author: pchampin

spec/index.html

@@ -1663,9 +1663,9 @@ <h3>Generalized RDF</h3>
 </section>
 
 
+<span id="section-classic-full-interop"><!-- legacy anchor --></span>
 <section id="section-basic-full-interop" class="informative">
-  <h2><span id="section-classic-full-interop"><!-- legacy anchor --></span>
-    Interoperability between RDF [=Basic=] and RDF [=Full=]</h2>
+  <h2>Interoperability between RDF [=Basic=] and RDF [=Full=]</h2>
 
   <p class=issue>Should we make this section normative?</p>