Update references to event-display image (#2390)

Author: antoineco

docs/eventing/getting-started.md

@@ -155,8 +155,8 @@ Your event consumers receive the events sent by event producers. In this step, y
         spec:
           containers:
             - name: event-display
-              # Source code: https://github.com/knative/eventing-contrib/blob/release-0.6/cmd/event_display/main.go
-              image: gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/event_display@sha256:37ace92b63fc516ad4c8331b6b3b2d84e4ab2d8ba898e387c0b6f68f0e3081c4
+              # Source code: https://github.com/knative/eventing-contrib/tree/master/cmd/event_display
+              image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display
 
     ---
 
@@ -195,8 +195,8 @@ Your event consumers receive the events sent by event producers. In this step, y
         spec:
           containers:
             - name: event-display
-              # Source code: https://github.com/knative/eventing-contrib/blob/release-0.6/cmd/event_display/main.go
-              image: gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/event_display@sha256:37ace92b63fc516ad4c8331b6b3b2d84e4ab2d8ba898e387c0b6f68f0e3081c4
+              # Source code: https://github.com/knative/eventing-contrib/tree/master/cmd/event_display
+              image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display
 
     ---
 

docs/eventing/samples/helloworld/helloworld-go/README.md

@@ -343,7 +343,8 @@ mesh via the Broker and can be delivered to other services using a Trigger
        spec:
          containers:
            - name: helloworld-go
-             image: gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/event_display
+             # Source code: https://github.com/knative/eventing-contrib/tree/master/cmd/event_display
+             image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display
    ---
    # Service that exposes event-display app.
    # This will be the subscriber for the Trigger