Update broker url in getting-started.md

[josiemundi]

update broker url so demo works for later knative eventing version

Proposed Changes

• Update broker url to match the format of the broker url in v0.15.

[knative-prow-robot]

Hi @josiemundi. 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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[mpetason]

/ok-to-test

[matzew]

/lgtm
/approve

thanks for fixing this!

[abrennan89]

/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: abrennan89, josiemundi, matzew

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