fix regex under FAQ 3.6

Ran `make faq sitemap` to perform the above.

faq.html

@@ -453,7 +453,7 @@
 
 <!-- BEFORE: 1st line of markdown file: faq.md -->
 <h1 id="ioccc-faq-table-of-contents">IOCCC FAQ Table of Contents</h1>
-<p>This is FAQ version <strong>28.2.21 2025-07-31</strong>.</p>
+<p>This is FAQ version <strong>28.2.22 2025-08-24</strong>.</p>
 <h2 id="entering-the-ioccc-the-bare-minimum-you-need-to-know">0. <a href="#enter_questions">Entering the IOCCC: the bare minimum you need to know</a></h2>
 <ul>
 <li><strong>Q 0.0</strong>: <a class="normal" href="#enter">How can I enter the IOCCC?</a></li>
@@ -3080,7 +3080,7 @@ for how to find your own <em>author_handle</em>.</p>
 POSIX safe string plus the use of <code>+</code> (for technical reasons beyond this
 answer). In particular, the <code>author_handle</code> must be an ASCII string or
 32 characters or less that matches this regexp:</p>
-<pre><code>    ^[0-9A-Za-z][0-9A-Za-z._+-]*$&quot;</code></pre>
+<pre><code>    ^[0-9A-Za-z][0-9A-Za-z._+-]*$</code></pre>
 <p>Default <code>author_handle</code>’s do not have multiple consecutive <code>_</code> (underscore)
 characters. Nevertheless, multiple consecutive <code>_</code> (underscore) characters are
 allowed. Contest submitters who wish to override their default <code>author_handle</code>