Minor fixes to 1991/fine/README.md

I can now report that this file is more or less fine! :-)

... though I am sure I will check it at least once more ...

1991/fine/README.md

@@ -9,10 +9,19 @@
 
 ## To build:
 
+```sh
 make all
+```
+
+## To run:
+
+```sh
+echo text | ./fine
+```
 
 ## Try:
 
+```sh
 echo "green terra
 vex
 tang
@@ -20,8 +29,9 @@ vend onyx
 cheryl be flashy
 rail
 clerk" | ./fine
+```
 
-## Judges' comments
+## Judges' comments:
 
 This filter, 80 chars plus a newline, fits into a single line on most 
 terminals (unless your terminal has a line wrap mis-feature :-)).