Update index.html

Author: coding-horror

index.html

@@ -97,7 +97,7 @@ <h2>
                     <a id="how" class="anchor" href="#how"></a>How can I help?
                 </h2>
 
-                <p>Exercise our <a href="https://code.commonmark.org/">reference implementations</a>, or <a href="https://github.com/jgm/CommonMark/wiki/List-of-CommonMark-Implementations">find a community implementation</a> in your preferred environment or language. Provide <a href="https://talk.commonmark.org"></a>feedback!</p>
+                <p>Exercise our <a href="https://github.com/commonmark">reference implementations</a>, or <a href="https://github.com/jgm/CommonMark/wiki/List-of-CommonMark-Implementations">find a community implementation</a> in your preferred environment or language. Provide <a href="https://talk.commonmark.org"></a>feedback!</p>
 
                 <p>If a CommonMark implementation does not already exist in your preferred environment or language, try <strong>implementing your own CommonMark parser</strong>. One of our major goals is to <a href="https://spec.commonmark.org/">strongly specify Markdown</a>, and to eliminate the many old inconsistencies and ambiguities that made using Markdown so difficult. Did we succeed?</p>