Update spec/index.html

Co-authored-by: Olaf Hartig <[email protected]>

Author: rubensworks

spec/index.html

@@ -1372,7 +1372,7 @@ <h3>Version Announcement</h3>
           When writing SPARQL queries with new features such as
           <a data-cite="RDF12-CONCEPTS#dfn-triple-term">triple terms</a>
           or <a href="#func-triple-terms">functions on triple terms</a>,
-          authors MAY announce the use of the new syntax forms using these directives.
+          authors MAY announce the use of the new syntax forms by including this directive.
         </p>
         <pre class="query nohighlight">
               VERSION "1.2"