ecr-credential-provider: clean up docs

[stmcginnis]

What type of PR is this?

/kind cleanup /kind documentation

What this PR does / why we need it:

This cleans up some of the documentation for the ecr-credential-provider command to expand on some details and fix some minor formatting in the example configuration.

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: olemarkus

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [olemarkus]

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