Fix broker URL to broker-ingress.knative-eventin.svc in eventing getting started guide

[nak3]

The latest broker's URL is different.

$ kubectl get broker -n event-example
NAME      READY   REASON   URL                                                                              AGE
default   True             http://broker-ingress.knative-eventing.svc.cluster.local/event-example/default   37m

It seems that knative/eventing@8a541e9 changed it, so this patch updates the doc.

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[nak3]

/assign @lionelvillard

[nak3]

It seems only 0.15 doc #2585 had the fix.

[grantr]

Sorry @nak3, this one fell off my radar. Looks like #2758 fixed the broker URLs and generated the conflict here. This PR has a few additional changes to the event-display output examples. If you want to get those in, please rebase, but I don't think they're required. Feel free to close instead.

[knative-prow-robot]

@nak3: PR needs rebase.

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[nak3]

Sure, no problem. Let's close this.