Update prometheus.md

[ecormaksin]

Discussed in the StackOverFlow, I couldn't get docker endpoint metrics on Ubuntu 20.04 (with "metrics-addr" : "127.0.0.1:9323" on /etc/docker/daemon.json, - targets: ['localhost:9323'] on prometheus.yml, http://localhost:9090/targets/ on url). By default, a docker container cannot access via localhost, can it? So if it is true, I think that we should use 127.0.0.1 insted of localhost.

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[usha-mandya]

@thaJeztah Could you PTAL?

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

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