Update index.html via @pchampin

Co-Authored-By: Pierre-Antoine Champin <[email protected]>

Author: gkellogg

index.html

@@ -1644,7 +1644,7 @@ <h3>Algorithm</h3>
         <li>If <var>value</var> contains the <a>entry</a> <code>@id</code> and its value
           does not equal <var>term</var>:
           <ol>
-            <li id="ctd-id-null">If <var>value</var> contains the <code>@id</code> <a>entry</a>
+            <li id="ctd-id-null">If the <code>@id</code> <a>entry</a> of <var>value</var>
               is <code>null</code>, the term is not used for IRI expansion, but is
               retained to be able to detect future redefinitions of this term.</li>
             <li id="ctd-id-not-null">Otherwise: