Fix html files in 2001

This also includes a few updates to the bugs file.

2001/williams/index.html

@@ -409,7 +409,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- BEFORE: 1st line of markdown file: 2001/williams/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make</code></pre>
-<p>NOTE: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
+<p><strong>NOTE</strong>: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
 compile. For more information see the
 FAQ on “<a href="../../faq.html#X11">X11</a>”.</p>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>