fix broken link to ref doc (#4308)

Author: lionelvillard

docs/eventing/channels/create-default-channel.md

@@ -5,7 +5,7 @@ Channel object.
 
 To create a Channel:
 
-1. Create a YAML file for the [Channel object](https://knative.dev/docs/reference/api/eventing/#messaging.knative.dev/v1.Channel)
+1. Create a YAML file for the [Channel object](https://knative.dev/docs/reference/api/eventing-api/#messaging.knative.dev/v1.Channel)
 using the following template:
 
     ```yaml

docs/eventing/channels/subscriptions.md

@@ -7,7 +7,7 @@ known as the Subscriber) to deliver events to. You can also specify some Sink-sp
 as how to handle failures.
 
 For more information about Subscription objects, see
-[Subscription](https://knative.dev/docs/reference/api/eventing/#messaging.knative.dev/v1.Subscription).
+[Subscription](https://knative.dev/docs/reference/api/eventing-api/#messaging.knative.dev/v1.Subscription).
 
 ## Creating a Subscription