Point out bug in 2014/vik in years.html

This is to let the viewers know that sometimes the program will display
invalid input. The note is modelled after some of the other entries that
have bug reports. Okay it's also some shameless self promotion but never
mind that! :-)

As well a few minor changes in 2014/vik/README.md mostly being removing
double spaces in favour of single spaces (particularly in the general
text). There were some other formatting fixes as well.

In 2020/ferguson2/README.md I made a few adjustments as well (though I'm
aware of a few more changes in 2020/ferguson[12]/README.md I want to
make).

years.html

@@ -935,6 +935,10 @@ Contest </I></FONT></CENTER>
 <LI><A HREF="2014/vik/Makefile">Makefile</A>
 <LI><A HREF="2014/vik/README.md">README.md</A>
 <LI><A HREF="2014/vik/prog.c">prog.c</A>
+<LI>A minor bug that shows up in some cases was found by
+<a href="winners.html#Cody_Boone_Ferguson">Cody Boone Ferguson</a>
+when working on his <a href="#2020_ferguson2">2020 Enigma machine</a>. See his
+README.md file for details (search for vik).
 </UL>
 <A NAME="2014_wiedijk"></A>
 <P><B>wiedijk</B> - Y combinator</P>