Fix sequence with broker image to show correct filter

[creydr]

In the sequence with broker docs, the following image is used to give an overview of the example sequence:

Anyhow in the examples later the trigger for the broker to the sequence, filters on type: dev.knative.sources.ping: https://github.com/knative/docs/blob/2d2d2f59117be87dc261ba7ba99190755d07cf1a/docs/eventing/flows/sequence/sequence-with-broker-trigger/README.md?plain=1#L172-L189

And the trigger for the event-display filters on type: samples.http.mod3: https://github.com/knative/docs/blob/2d2d2f59117be87dc261ba7ba99190755d07cf1a/docs/eventing/flows/sequence/sequence-with-broker-trigger/README.md?plain=1#L199-L226

This PR addresses it and updates the image to show the correct "types" for the filters.

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[abrennan89]

@knative/eventing-wg-leads please review

[csantanapr]

Thank you @creydr for the fix, the new diagram is correct now /lgtm /approve

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[APPROVALNOTIFIER] This PR is APPROVED

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

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