Update cheat ssh

cheat/cheatsheets/ssh

@@ -4,6 +4,9 @@ ssh -i /path/to/file.pem user@example.com
 # To connect on an non-standard port:
 ssh -p 2222 user@example.com
 
+# To connect and forward the authentication agent
+ssh -A user@example.com
+
 # To execute a command on a remote server:
 ssh -t user@example.com 'the-remote-command'