Fix "every" syntax example
Fix "every" syntax example

Rufus expects single characters for intervals, as in `1h`.

If we use `1hr`, Rufus seems to still accept it via a `DateTime.parse` fallback. No idea how `DateTime.parse('1hr')` is interpreted, but it gives a different result.

Moove-it/sidekiq-scheduler,Moove-it/sidekiq-scheduler