fix a few more standard header lines in winner README.md files

1989/jar.1/README.md

@@ -28,10 +28,12 @@ NOTE: this will run the program itself:
 make clobber all
 ```
 
+
 ## Alternate code:
 
 This code, which prints something slightly different, is provided as well.
 
+
 ### Alternate build:
 
 NOTE: this will run the program itself.