Fix heading level of 'Try' section

It was agreed to be '## Try:' but there were many files where it was
'### Try:'. This has been corrected.

2000/jarijyrki/README.md

@@ -16,7 +16,7 @@ You will need X11 header files and libraries installed to build this program.
 You will need a system capable of displaying the results of X Window programs.
 
 
-### Try:
+## Try:
 
 ```sh
 ./jarijyrki < finance.sheet > myedits.info