JobMaxRecurrence.Interval has incorrect description

Copied from https://github.com/Azure/azure-sdk-for-go/issues/1822
The property Interval's description states:
// Interval - Gets or sets the interval between retries.
when it really is the max interval between recurrences. Additionally the property above it: RecurrenceFrequency doesn't state its the max frequency, but this is less wrong.
https://github.com/Azure/azure-rest-api-specs/blob/master/specification/scheduler/resource-manager/Microsoft.Scheduler/stable/2016-03-01/scheduler.json#L1352

Open specification/scheduler/resource-manager/Microsoft.Scheduler/stable/2016-03-01/scheduler.json around line 1352 and inspect JobMaxRecurrence.Interval and RecurrenceFrequency. Update the descriptions to reflect their maximum recurrence interval and frequency, then verify the specification remains valid.

Written by the indexing model from the issue text.