[stable/rabbitmq] Update README

[senk]

Fix some missing apostrophes in rabbitmq README

[k8s-ci-robot]

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[senk]

/assign @carrodher

[juan131]

Hi @senk

Even if you're just updating the README.md, you'll need to bump the patch version of the chart (Chart.yml) in order to pass the CI tests. Could you please update your PR bumping it?

[juan131]

/ok-to-test
/lgtm

[k8s-ci-robot]

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This pull-request has been approved by: juan131, senk

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