Add micrometer integration to documentation

[TsingLiang]

Now I can use prometheus with micrometer，can I use cloudwatch metrics autoconfigure in boot2 with micrometer? I didn't see it in docs

[spencergibb]

You can, with https://github.com/spring-cloud/spring-cloud-aws/blob/master/spring-cloud-aws-actuator/pom.xml#L39