Update some of the 2000 README.md files

I am aware of some entries that do not compile that I haven't even
thought about fixing yet.

I also need to use my linux box to test the X11 entries (this goes for
other years as well) but that'll come at another time as I rarely am at
sitting at that computer. But the README.md files should be in a better
state.

2000/dhyang/README.md

@@ -50,7 +50,7 @@ study it, but the layout itself is where most of the interest lies.
 
 ## Author's comments:
 
-This one is dedicated to Saitou Hajime fans ^_^x
+This one is dedicated to Saitou Hajime fans `^_^x`
 
 Instead of making one self reproducing program, what I made was a
 program that generates a set of mutually reproducing programs, all of