Minor fixes needed in Document Expiry Tutorial

The "or" in this statement needs to be removed:
"Goal: When a document in an existing bucket is about to expire, a new document or is created in a different bucket."

Couple of other sentences that could use some cleanup on the same page:

The example requires a document to be created in the 'source' bucket with a key of SampleDocument2, a value of

, and most importantly that the document’s expiration (or TTL) be set to 600 seconds or 10 minutes*)*.

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Wait a few minutes, return to Eventing in the UI and Look at the Log again for add_timer_before_expiry at two minutes before the TTL was scheduled the timer will have fired and executed DocTimerCallback (note the logs display by the "Log" link are in reverse time order)