Updates the cron schedule docs with the correct DoW

Signed-off-by: joshvanl <[email protected]>

Author: JoshVanL

api/job.pb.go

@@ -51,7 +51,7 @@ message Job {
   //
   // Systemd timer style cron accepts 6 fields:
   // seconds | minutes | hours | day of month | month        | day of week
-  // 0-59    | 0-59    | 0-23  | 1-31         | 1-12/jan-dec | 0-7/sun-sat
+  // 0-59    | 0-59    | 0-23  | 1-31         | 1-12/jan-dec | 0-6/sun-sat
   //
   // "0 30 * * * *" - every hour on the half hour
   // "0 15 3 * * *" - every day at 03:15