ratelimit
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update docs on stats
When trying to switch to the new prometheus sink instead of a custom statsd-exporter, the pod crashed since USE_STATSD
defaults to true and I hit the below error: https://github.com/envoyproxy/ratelimit/blob/28b1629a21e885bdd2b527d6a1c1de8483dc47d4/src/service_cmd/runner/runner.go#L65-L68.
This PR should make it clearer that USE_STATSD: false
is required for prometheus and dog_stats.