functions: single event handlers are no longer necessary when batching #1734
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Proposed changes
I removed a section from the functions doc that's no longer applicable. Previously we would require that customers write both a batch handler and single event handlers when batching, in case our system wasn't able to form a batch with more than one event.
This is no longer necessary. When batching, centrifuge will invoke the batch handler even if there's only one event in the batch (https://github.com/segmentio/centrifuge/pull/1803).
Merge timing
ASAP once approved.