Note CronJob timezone comes from system timezone

The timezone for the kube-controller-manager (or if that's broken apart,
the cronjob controller) determines when CronJobs are scheduled.

This reverts commit bad124b857.

content/en/docs/concepts/workloads/controllers/cron-jobs.md

@@ -18,7 +18,7 @@ One CronJob object is like one line of a _crontab_ (cron table) file. It runs a
 on a given schedule, written in [Cron](https://en.wikipedia.org/wiki/Cron) format.
 
 {{< note >}}
-All **CronJob** `schedule:` times are denoted in UTC.
+All **CronJob** `schedule:` times are based on the timezone of the master where the job is initiated.
 {{< /note >}}
 
 When creating the manifest for a CronJob resource, make sure the name you provide