Updated cwagent-emf.README.md to represent more current aws docs:
metrics_collected – This is a legacy field that specified that the agent is to collect logs that are in embedded metric format. You can generate metric data from these logs. It contained the emf field which specified that the agent is to collect metrics embedded in logs. To collect metrics embedded in logs it is no longer necessary to include either the metrics_collected field or the emf field.
Issue
Description of changes:
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-Configuration-File-Details.html#CloudWatch-Agent-Configuration-File-Logssection
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