RabbitMQ scaler documentation should be more clear abuot vhost

[daniel-habib]

RabbitMQ can have many vhosts (each holding many queues)
a user might be permitted to read just some vhosts.
when one tries to use a user that can access just some vhost - one get the following messages:
error establishing rabbitmq connection: Exception (403) Reason: \"no access to this vhost\""

using url notation like specified here: https://www.rabbitmq.com/uri-spec.html (e.g. amqp://1.1.11:5672/vhost) - solves this.

it would be helpful to have documentation state that clearly.

[jeffhollan]

Thanks @daniel-habib - makes sense

[zroubalik]

Probably solved by: kedacore/keda-docs#123

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