updateCron

[mrclintoka]

Another person was wondering why the cron job did not have a oracle contract address. In the Chainlink disccord they were wondering how they get paid in cron jobs. I'm still not sure the best way to setup up payment for cron jobs, but I updated some explaination to the cron docs. I sought clarification on stackoverflow and got answers from a chainlink member. I pretty much copied and pasted to update the cron job. I hope I'm helping, let me know if these edits are acceptable.

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