Add missing noughts and crosses entry to faq.html

Okay, tic tac toe - but that's the same thing.

In 2020 it became even more unlikely that an entry of said game could
win but the FAQ was not updated.

faq.html

@@ -91,6 +91,9 @@ given to be aware of the level of the competition):
 
 <LI>
 <A HREF="years.html#1996_jonth">1996/jonth</A></LI>
+
+<LI>
+<A HREF="years.html#2020_carlini">2020/carlini</A></LI>
 </UL>
 
 <P><LI>