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.

1992/westley/README.md

@@ -37,7 +37,7 @@ prohibitive if it cannot be compiled and linked (it uses curses); instead one
 should just use the `westley` and `westley.alt` programs directly.
 
 
-### Try:
+## Try:
 
 ```sh
 ./whereami 47 -122	# NOTE: - means west of meridian