Merge pull request #1208 from Fred-O-Nyarko/patch-1

Update commandline-injection.md

Author: andrewnicols

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`.