(eventing helloworld-python) add missing Broker and reformat YAML

[boramalper]

Signed-off-by: Bora M. Alper bora@boramalper.org

Fixes #3653.

Proposed Changes

• Add missing Broker
• Reformat YAML
• Remove the username in the Docker image URL

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow-robot]

Welcome @boramalper! It looks like this is your first PR to knative/docs 🎉

[knative-prow-robot]

Hi @boramalper. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[boramalper]

@googlebot I signed it!

[abrennan89]

/ok-to-test

@vaikas is this one duplicating any work from #3682?

[csantanapr]

See my comments on #3682 (review)

[abrennan89]

I believe these changes have already been made in #3682
@boramalper you may want to rebase your PR and see if there's anything else in this PR that changed, otherwise I think this one can be closed?

[knative-prow-robot]

@boramalper: PR needs rebase.

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