docs: Update review guidelines #3238

Job	Run time
mysql / mysql2 / ubuntu-latest	1m 30s
kafka / racecar / ubuntu-latest	11m 27s
mysql / trilogy / ubuntu-latest	1m 30s
kafka / rdkafka / ubuntu-latest	15m 58s
kafka / ruby_kafka / ubuntu-latest	5m 41s
postgresql / pg / ubuntu-latest	3m 27s
rabbitmq / bunny / ubuntu-latest	1m 7s
postgresql / que / ubuntu-latest	2m 23s
redis / redis / ubuntu-latest	1m 6s
redis / resque / ubuntu-latest	1m 43s
other / dalli / ubuntu-latest	2m 33s
redis / sidekiq / ubuntu-latest	6m 7s
other / mongo / ubuntu-latest	2m 43s
	57m 15s

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