Trigger CRD reference refers to Knative

[jmcx]

Am assuming this should be replaced?

Same with target just above.

[jmcx]

Also am realising that the CRD reference simply doesn't provide the full description of the delivery spec.

Also, the knative definition of deadlettersink says: "The destination can be a Knative Service or a URI." What is it for us now? So far I'm just showing an example with a uri to be safe.