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Document all event delivery parameters (#2752) 

* Document all event delivery parameters

Signed-off-by: Pierangelo Di Pilato <pierangelodipilato@gmail.com>

* Fix typo: linerar -> linear

Signed-off-by: Pierangelo Di Pilato <pierangelodipilato@gmail.com>
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docs/eventing/event-delivery.md
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@ -39,6 +39,8 @@ The `deadLetterSink` specifies where to send events that failed be consumed by `
## Common Delivery Parameters
The `delivery` value must be a [Delivery Spec](https://pkg.go.dev/knative.dev/eventing/pkg/apis/duck/v1?tab=doc#DeliverySpec)
### deadLetterSink
When present, events that failed to be consumed are sent to the `deadLetterSink`.
@ -50,6 +52,9 @@ The `deadLetterSink` value must be a [Destination](https://pkg.go.dev/knative.de
spec:
delivery:
deadLetterSink: <Destination>
retry: <number of retries>
backoffPolicy: <linear or exponential>
backoffDelay: <ISO8601 duration>
```
## Channel Support
@ -58,7 +63,7 @@ The table below summarizes what delivery parameters are supported for each chann
| Channel Type | Supported Delivery Parameters |
| - | - |
| In-Memory | `deadLetterSink` |
| Kafka | none |
| In-Memory | `deadLetterSink`, `retry`, `backoffPolicy`, `backoffDelay` |
| Kafka | `deadLetterSink`, `retry`, `backoffPolicy`, `backoffDelay` |
| Natss | none |
| GCP PubSub | none |