Mark "atomic" term as exported to silence warnings.

Author: gkellogg

spec/index.html

@@ -703,7 +703,7 @@ <h3>RDF Terms</h3>
       <span id="dfn-rdf-terms"><!-- obsolete term--></span><dfn data-lt="rdf term">RDF terms</dfn>.</p>
 
     <p>
-      [=IRIs=], [=literals=] and [=blank nodes=] are said to be <dfn data-lt-no-plural>atomic</dfn> [=RDF terms=].
+      [=IRIs=], [=literals=] and [=blank nodes=] are said to be <dfn class="export" data-lt-no-plural>atomic</dfn> [=RDF terms=].
     </p>
 
     <p><dfn>RDF term equality</dfn>: