Remove redundant link

spec/index.html

@@ -1095,7 +1095,7 @@ <h4 id="fragments">4.1.6 Fragment identifiers</h4>
         <p>TBD</p>
         <h3 id="structure">4.2 Structure</h3>
         <p>This section is normative.</p>
-        <h4 id="the-document-object">4.2.1 The <code><a href="#the-document-object">Document</a></code> object</h4>
+        <h4 id="the-document-object">4.2.1 The <code>Document</code> object</h4>
         <p>
           A MapML document is a [<a href="#ref-MicroXML">MicroXML</a>] document. As such, it MUST have a single root element named &lt;mapml&gt;. It MUST NOT have a DOCTYPE declaration; attributes named 'xmlns' and names containing a colon
           character ':' (U+003A) are not permitted. Other restrictions relative to XML syntax are enumerated in [<a href="#ref-MicroXML">MicroXML</a>].