Fixes in 1998 html files

This includes some notices to those who wish for a greater challenge.

In the 1998/schweikh3 the man page (and its copy to demonstrate the
entry) have been updated slightly but only in comment (move 'or' from
the command suggested to render it in text to its own line before the
next command also in comment).

The bugs file was updated for an entry or two.

1998/dlowe/index.html

@@ -487,8 +487,8 @@ can look at locally in a browser or pipe through <code>less(1)</code>. For insta
 <p>where the first one would show the text as rendered but without links, images
 etc. and the second one would write the html to <code>ms.html</code> so that you could open
 it in a browser.</p>
-<p>For an old example of it working as a CGI script see:</p>
-<pre><code>    https://web.archive.org/web/20040326083431/http://www.pootpoot.com/poot/pootify/?URL=http%3A%2F%2Fwww.ioccc.org</code></pre>
+<p>For an old example of it working as a CGI script see
+<a href="https://web.archive.org/web/20040326083431/http://www.pootpoot.com/poot/pootify/?URL=http%3A%2F%2Fwww.ioccc.org" class="uri">https://web.archive.org/web/20040326083431/http://www.pootpoot.com/poot/pootify/?URL=http%3A%2F%2Fwww.ioccc.org</a>.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>This program is a text filter, it reads <code>stdin</code> and outputs the
 “corrected” text to <code>stdout</code>.</p>