Fix html files in 2001

This also includes a few updates to the bugs file.

2001/coupard/index.html

@@ -411,6 +411,10 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <pre><code>    make</code></pre>
 <h2 id="to-use">To use:</h2>
 <pre><code>    ./coupard</code></pre>
+<p><strong>NOTE</strong>: the author notes that you might want to convert the sound formats. For
+this you can use <code>SoX</code>. If you do not have this installed then see the
+FAQ on “<a href="../../faq.html#sox">using entries that require sound</a>”
+for help.</p>
 <h2 id="try">Try:</h2>
 <pre><code>    ./try.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>