remove dangling reference to deleted Appendix D and clarify normative meaning statement

Author: pfps

spec/index.html

@@ -1052,8 +1052,8 @@ <h2>RDF Interpretations</h2>
     </tr>
   </table>
 
-  <p>RDF imposes no particular normative meanings on the rest of the RDF vocabulary.
-    <a href="#whatnot">Appendix D</a> describes the intended uses of some of this vocabulary.</p>
+  <p>RDF intrepretations impose no particular normative semantics on the rest of the RDF vocabulary.
+</p>
 
   <p>The datatype IRIs 
     <a data-cite="RDF12-CONCEPTS#dfn-language-tagged-string"><code>rdf:langString</code></a>,