Add vhostName to Auth Params RabbitMQ doc

[dttung2905]

Update the doc to show how vhostName can be added to auth Params referencing a secret

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Fixes kedacore/keda#6373

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[dttung2905]

Hmm. I think the CI linting check has been failing for some times ( I glanced at the last few PRs and all has the same failure ). Is it something that we have to fix before we merge @JorTurFer ?