Fix duplicate id.

Author: gkellogg

index.html

@@ -2480,7 +2480,7 @@ <h3>Algorithm</h3>
           (where <a>entries</a> are <span class="changed"><a data-lt="IRI expanding">IRI expanded</a></span>,
           set <var>active context</var> to <a>previous context</a> from <var>active context</var>,
           as the scope of a term-scoped <a>context</a> does not apply when processing new <a>node objects</a>.</li>
-        <li id="alg-expand-property-scoped-context2" id="alg-expand-property-scoped-context" class="changed">If <var>property-scoped context</var> is defined,
+        <li id="alg-expand-property-scoped-context2" class="changed">If <var>property-scoped context</var> is defined,
           set <var>active context</var> to the result of the
           <a href="#context-processing-algorithm">Context Processing algorithm</a>,
           passing <var>active context</var>, <var>property-scoped context</var> as <var>local context</var>,