* tz-art.html: Fix typo re xkcd strips vs panels.

tz-art.html

@@ -490,21 +490,22 @@ Supernaw.</td></tr>
 <h2>Comics</h2>
 <ul>
 <li>
-The webcomic <em>xkcd</em> has the strip
-"<a href="https://xkcd.com/673/">The Sun</a>" (2009-12-09) and the panels
+The webcomic <em>xkcd</em> has the strips
+"<a href="https://xkcd.com/673/">The Sun</a>" (2009-12-09),
+"<a href="https://xkcd.com/1655/">Doomsday Clock</a>" (2016-03-14) and
+"<a href="https://xkcd.com/2549/">Edge Cake</a>" (2021-12-01),
+along with the panels
 "<a href="https://xkcd.com/448/">Good Morning</a>" (2008-07-11),
 "<a href="https://xkcd.com/1017/">Backward in Time</a>" (2012-02-14),
 "<a href="https://xkcd.com/1061/">EST</a>" (2012-05-28),
 "<a href="https://xkcd.com/1179/">ISO 8601</a>" (2013-02-27),
 "<a href="https://xkcd.com/1335/">Now</a>" (2014-02-26),
-"<a href="https://xkcd.com/1655/">Doomsday Clock</a>" (2016-03-14),
 "<a href="https://xkcd.com/1799/">Bad Map Projection: Time Zones</a>"
 (2017-02-15),
 "<a href="https://xkcd.com/1883/">Supervillain Plan</a>" (2017-08-30),
 "<a href="https://xkcd.com/2050/">6/6 Time</a>" (2018-09-24),
 "<a href="https://xkcd.com/2092/">Consensus New Year</a>" (2018-12-31),
 "<a href="https://xkcd.com/2266/">Leap Smearing</a>" (2020-02-10),
-"<a href="https://xkcd.com/2549/">Edge Cake</a>" (2021-12-01),
 and "<a href="https://xkcd.com/2594/">Consensus Time</a>" (2022-03-16).
 The related book <em>What If?</em> has an entry
 "<a href="https://what-if.xkcd.com/26/">Leap Seconds</a>" (2012-12-31).