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:

docs/docs/eventing/flows/sequence/sequence-with-broker-trigger/README.md

Lines 172 to 189 in 2d2d2f5

	### Create the Trigger targeting the Sequence
	```yaml
	apiVersion: eventing.knative.dev/v1
	kind: Trigger
	metadata:
	name: sequence-trigger
	spec:
	broker: default
	filter:
	attributes:
	type: dev.knative.sources.ping
	subscriber:
	ref:
	apiVersion: flows.knative.dev/v1
	kind: Sequence
	name: sequence
	```

And the trigger for the event-display filters on type: samples.http.mod3:

docs/docs/eventing/flows/sequence/sequence-with-broker-trigger/README.md

Lines 199 to 226 in 2d2d2f5

	### Create the Service and Trigger displaying the events created by Sequence
	```yaml
	apiVersion: serving.knative.dev/v1
	kind: Service
	metadata:
	name: sequence-display
	spec:
	template:
	spec:
	containers:
	- image: gcr.io/knative-releases/knative.dev/eventing/cmd/event_display
	---
	apiVersion: eventing.knative.dev/v1
	kind: Trigger
	metadata:
	name: display-trigger
	spec:
	broker: default
	filter:
	attributes:
	type: samples.http.mod3
	subscriber:
	ref:
	apiVersion: serving.knative.dev/v1
	kind: Service
	name: sequence-display
	---

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

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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