Fix in 1991/westley/ttt.sh

Don't assume '.' is in the path.

I note that at least under macOS this game does not work. I'll be
looking at the entries of this year at another time. I just need this
commit in to make some other changes unrelated.

The README.md was also updated - formatting fixes to turn it into a
markdown file proper.

1991/westley/README.md

@@ -23,7 +23,7 @@
 		7 8 9
 
 If you omit 'move_location', then the computer moves first.  For your 
-    next move, recompile nextmove.c and play it again:
+next move, recompile `nextmove.c` and play it again:
 
 	make nextmove
 	./nextmove move_location | tee nextmove.c

1991/westley/ttt.sh

@@ -61,7 +61,7 @@ if [ ! -f merlyn.c ]; then
     fi
     # check to see if the copy worked
     if [ ! -f merlyn.c ]; then
-	echo "ttt: Darn, coundn't copy westley.c to merlyn.c" 1>&2
+	echo "ttt: Darn, couldn't copy westley.c to merlyn.c" 1>&2
 	exit 4
     fi
 fi
@@ -85,9 +85,9 @@ fi
 if [ ! -w ttt_game.c ]; then
     rm -f ttt_game.c 
     if [ -z "$move" ]; then
-	merlyn | tee ttt_game.c
+	./merlyn | tee ttt_game.c
     else
-	merlyn "$move" | tee ttt_game.c
+	./merlyn "$move" | tee ttt_game.c
     fi
     chmod +w ttt_game.c