Added mention of channels to event type autocreate docs

[Cali0707]

This adds mention of eventtype auto create supporting the channel as well as the broker.

Proposed Changes

• Mention the channel when discussing event type autocreate working with brokers
• Make the Broker section subsections of the example, so that it is clear that this is only an example, and you don't need to use a Broker

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[Cali0707]

/cc @matzew

[Cali0707]

@matzew do you think it is worth adding an example of using this with a channel as well, or is this enough to show that it works with channels as well?

[dsimansk]

@matzew do you think it is worth adding an example of using this with a channel as well, or is this enough to show that it works with channels as well?

Have we done channel auto-create implementation yet? Because my PR was only on broker ingress.

[Cali0707]

Have we done channel auto-create implementation yet? Because my PR was only on broker ingress.

@dsimansk I added it here: knative/eventing#7089

[dsimansk]

Thanks @Cali0707!

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, dsimansk

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[dsimansk]

/cherry-pick release-1.11

[knative-prow-robot]

@dsimansk: new pull request created: #5645

In response to this:

/cherry-pick release-1.11

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