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.

1996/eldby/README.md

@@ -20,7 +20,7 @@ To quit send intr (typically ctrl-c).
 NOTE: to reset the sanity of your terminal after this program ends try `reset`.
 
 
-### Try:
+## Try:
 
 This alternate version, which we recommend that you use in order to see what is
 happening with modern systems, and to not flash too quickly, which can be