Update 1989 winning entries' README.md files

Format and typo fixes.

1989/jar.1/README.md

@@ -1,34 +1,40 @@
 # Strangest abuse of the rules
 
-	Jari Arkko
-	Laboratory of Information Processing Science
-	Helsinki University of Technology
-	Otakaari 1
-	02150 Espoo
-	Finland
+Jari Arkko  
+Laboratory of Information Processing Science  
+Helsinki University of Technology  
+Otakaari 1  
+02150 Espoo  
+Finland  
 
 ## To build and run:
 
-    make clobber all
+```sh
+make clobber all
+```
 
-## Judges notes:
+## Judges' remarks:
 
 On many systems the compiler will not allow you to send the object file to
 /dev/tty.  The author suggested:
 
-	cc -c -o /dev/tty jar.1.c
+```sh
+cc -c -o /dev/tty jar.1.c
+```
 
 On systems that have symbolic links, we suggest:
 
-	ln -s /dev/tty jar.1.o
-	cc -c jar.1.c
+```sh
+ln -s /dev/tty jar.1.o
+cc -c jar.1.c
+```
 
 As a last resort the scripts provided simply cat the .o file to the terminal.
 
 Abuse of the rules winners usually result in a change of the rules.  Starting in
 1990, compiling entries must result an regular file which can be executed.
 
-## Selected notes from the author:
+## Author's remarks:
 
 This program is (supposedly) the smallest C program able to print "Hello
 world.". The compilation itself produces the desired printout and the program