Fix typos, formatting and thank yous (add links)

In some files changed the formatting was fixed to be a proper markdown
file.

There were some typos including that some README.md files that linked to
/winners.html#Cody_Boone_Ferguson actually linked to the non-existent
file /years which obviously would not work.

I also added links to the rest of the places I have fixed entries (but
see below) and I did the same for Yusuke Endoh's fixes.

As well apparently one entry I thought he fixed to compile under modern
systems does not seem to so that entry will have to be revisited another
time. That entry was 1993/jonth.

Those are the main changes here if not all of them.

1986/wall/README.md

@@ -11,11 +11,14 @@ US of A
         make all
 
 
+We used a patch provided by [Yusuke Endoh](/winners.html#Yusuke_Endoh) to make
+this work with gcc. Thank you Yusuke!
+
 NOTE: On modern systems this entry requires the option `-traditional-cpp` which
 clang does not support. Please be advised that gcc under macOS is actually
 clang so this will not compile with the default gcc under macOS. As this entry
-stood in modern systems it did not work even when compiled. We used a patch
-provided by Yusuke Endoh to make it work. Thank you Yusuke!
+stood in modern systems it did not work even when compiled.
+
 
 ## Judges' comments: