Fix issues in broker docs

[creydr]

PR fixes:

• some markdown syntax in the RabbitMQ Broker doc, so the code example is displayed properly (048ba6d8ae5beff5a01f6fc3ec84d223eca3224c)
• some broker spec indentation in the Broker configuration example (e9eb2d51d4a43f29d364ab419a2e13453884eebf)
• use correct target namespace for broker in broker configuration example, as the current namespace depends on the used kubeconfig context (6e41f0645d48cb2d4b381570c4b91d885c280e79)
• states support for RabbitMQ broker in configuration example (009f6d1bc8f06c8d45ee2e01a953eacbd7c3ac33)

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[abrennan89]

/lgtm /approve

[abrennan89]

/cherrypick release-1.7

[knative-prow-robot]

@abrennan89: once the present PR merges, I will cherry-pick it on top of release-1.7 in a new PR and assign it to you.

In response to this:

/cherrypick release-1.7

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[abrennan89]

/approve

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abrennan89, creydr

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[knative-prow-robot]

@abrennan89: new pull request created: #5240

In response to this:

/cherrypick release-1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[pierDipi]

One comment - please check with someone in the Eventing WG that this is true about the broker, I always thought it was the current namespace the user is in, not the literal default namespace, but I might be wrong.

Yes, this is generally true, it's not the literal default but it is the default namespace in the context which is usually default but it might be differerent.

Otherwise lgtm! Happy to approve once this is confirmed.