Improved FAQ 5.5 related to unknown and anonymous locations

Ran `make www` to perform test the above under macOS.

faq.html

@@ -2171,6 +2171,13 @@ of the <a href="https://github.com/ioccc-src/winner">ioccc-src/winner repo</a>.<
 <p>See also the <a href="#ull_request">FAQ 6.10 How does someone
 make a change to a file and submit that change as a GitHub pull
 request</a> for more information about pull requests.</p>
+<p><strong>FYI</strong>: The <a href="location.html#ZZ">ZZ - Unknown location</a> is used for
+historic winning authors whose location or country is not known,
+whereas the <a href="location.html#XX">XX - Anonymous location</a> is used when the
+winning author does <strong>not wish to disclose their location</strong>.</p>
+<p>Unless you are the author who originally selected the <strong>XX - Anonymous
+location</strong>, please do not attempt to change an <strong>XX - Anonymous
+location</strong>, without the permission of the original author.</p>
 <div id="faq5_6">
 <div id="fix_link">
 <h2 id="faq-5.6-what-should-i-do-if-i-find-a-broken-or-wrong-web-link">FAQ 5.6: What should I do if I find a broken or wrong web link?</h2>