Remove '|' marker from old guideline

A guideline that was there in previous years still had the '|' marker
which is supposed to be only for changes. This has been removed.

next/guidelines.html

@@ -413,7 +413,7 @@ writing by <a href="../contact.html">contacting the judges</a>.</p>
 <div id="guidelines_version">
 <h2 id="ioccc-guidelines-version">IOCCC Guidelines version</h2>
 </div>
-<p><strong><code>|</code></strong> These <a href="guidelines.html">IOCCC guidelines</a> are version <strong>28.5 2024-07-05</strong>.</p>
+<p><strong><code>|</code></strong> These <a href="guidelines.html">IOCCC guidelines</a> are version <strong>28.6 2024-07-06</strong>.</p>
 <p><strong>IMPORTANT</strong>: Be <strong>SURE</strong> to read the <a href="rules.html">IOCCC rules</a>.</p>
 <div id="change_marks">
 <h3 id="change-marks">Change marks</h3>
@@ -1070,7 +1070,7 @@ some Intel-like x86 architecture.</p>
 <p>Get your facts first, then you can distort them as you please.</p>
 </blockquote>
 <p>… is a good motto for those writing code for the IOCCC.</p>
-<p><strong><code>|</code></strong> The <a href="https://github.com/ioccc-src/mkiocccentry/blob/master/iocccsize.c">IOCCC size tool source</a>
+<p>The <a href="https://github.com/ioccc-src/mkiocccentry/blob/master/iocccsize.c">IOCCC size tool source</a>
 is not an original work, unless you are <a href="../authors.html#Anthony_C_Howe">Anthony C
 Howe</a>, in which case it is original! :-)
 Submitting source that uses the content of iocccsize.c, unless you are