update timedatectl code example

Example 1: timedatectl

# timedatectl  status

Example 2: timedatectl

# timedatectl list-timezones |  egrep  -o “Asia/B.*”
# timedatectl list-timezones |  egrep  -o “Europe/L.*”
# timedatectl list-timezones |  egrep  -o “America/N.*”