404 link in the error messsage

[july2993]

using release-4.0 branch to deploy
while running:
ansible-playbook rolling_update.yml

TASK [check_system_dynamic : Preflight check - NTP service] ***************************************************************************************************************************************************************************************************************
fatal: [172.16.5.70]: FAILED! => changed=false
  msg: Make sure NTP service is running and ntpstat is synchronised to NTP server. See https://github.com/pingcap/docs/blob/master/dev/how-to/deploy/orchestrated/ansible.md#how-to-check-whether-the-ntp-service-is-normal .

NO MORE HOSTS LEFT ********************************************************************************************************************************************************************************************************************************************************
        to retry, use: --limit @/home/tidb/zoom/tidb-ansible1/retry_files/rolling_update.retry

PLAY RECAP **************************************************************************************************

404 for:
https://github.com/pingcap/docs/blob/master/dev/how-to/deploy/orchestrated/ansible.md#how-to-check-whether-the-ntp-service-is-normal

[liubo0127]

Got, I will fix it.