Update 1989 winning entries' README.md files

Format and typo fixes.

1989/roemer/README.md

@@ -1,34 +1,37 @@
 ## Best layout
 
-	Lievaart, Roemer B.
-	VU-Informatica, Amsterdam
-	Marcusstraat 29/2, 
-	NL 1091 TJ Amsterdam
-	Netherlands
+Lievaart, Roemer B.  
+VU-Informatica, Amsterdam  
+Marcusstraat 29/2,   
+NL 1091 TJ Amsterdam  
+Netherlands  
 
 ## To build:
 
-	make all
+```sh
+make all
+```
 
 ## Try:
 
-	./roemer
+```sh
+./roemer
+```
 
 ## Judges' remarks:
 
 Do you know what this program does?  If you do, look again,
 there is more here than meets the PI.
 
-## Selected notes from the author:
+## Author's remarks:
 
 Passes lint, but not with the strictest options, for it
 contains some "null-statements", as well two identifiers
 which are, if compilers only take 6 characters, the same.  It
 also uses write(2), so not totally system independent.
 
-You are very much invited to pass this program through a
-C-beautifier. (First strip newlines and tabs, if your cb can't
-do that.)
+You are very much invited to pass this program through a C-beautifier. (First
+strip newlines and tabs, if your `cb` can't do that.)
 
 ## Copyright and CC BY-SA 4.0 License: