Update commandline-injection.md

This commit corrects `Tyy` to `Try`

Author: Fred-O-Nyarko

general/development/policies/security/commandline-injection.md

@@ -25,7 +25,7 @@ However, when there is no other option, it is the standard approach of cleaning
 
 ## What you need to do in your code
 
-- Tyy to avoid using shell commands if at all possible.
+- Try to avoid using shell commands if at all possible.
   - Many utilities are available as PHP libraries.
 - If you can't avoid shell commands, use `escapeshellcmd` and `escapeshellarg`.