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.

1994/schnitzi/README.md

@@ -28,7 +28,7 @@ For more detailed information see [1994 schnitzi in bugs.md](/bugs.md#1994-schni
 ```
 
 
-### Try:
+## Try:
 
 ```sh
 ./schnitzi < /etc/motd 2>/dev/null