Fix metrics.md To Show How to Export Leader Pods for Sidecars

[mdzraf]

What type of PR is this?

/kind documentation

What is this PR about? / Why do we need it?

This PR adds the necessary commands needed to get the leader pods for manual metrics scraping in our metrics.md example.

How was this change tested?

Manually

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @mdzraf. Thanks for your PR.

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[AndrewSirenko]

Commands work locally, thanks for the improvement @mdzraf!

[torredil]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: torredil

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