Update spec/index.html

Co-authored-by: Andy Seaborne <[email protected]>

Author: hartig

spec/index.html

@@ -798,7 +798,7 @@ <h3>Literals</h3>
         (per [=IRI equality=]).</li>
       <li>The two <a>language tags</a> are either both absent, or both present and compare equal,
         where this comparison is performed using
-        <a data-cite="I18N-GLOSSARY##dfn-ascii-case-insensitive">ASCII case-insensitive matching</a>
+        <a data-cite="I18N-GLOSSARY#dfn-ascii-case-insensitive">ASCII case-insensitive matching</a>
         (in contrast to the case-sensitive comparison of the lexical forms).</li>
       <li>The two <a>base directions</a> are either both absent, both `ltr`, or both `rtl`.</li>
     </ul>