Update spec/index.html

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

Author: pchampin

spec/index.html

@@ -922,7 +922,7 @@ <h3>Literals</h3>
 
     <p>Literals are used for values such as strings, numbers, and dates.</p>
 
-    <p>A <dfn data-local-lt="RDF literal">literal</dfn> in an <a>RDF graph</a> consists of
+    <p>A <dfn data-local-lt="RDF literal">literal</dfn> consists of
       two, three, or four component elements, as follows:</p>
 
     <ol>