bad documentation: missing selector

[jonbcampos]

Describe the bug
The documentation to install knative-gcp seems wrong. There is an example to pull a selector messaging.cloud.google.com/crd-install=true, this doesn't exist in cloud-run-events.yaml.

kubectl apply \
  --selector messaging.cloud.google.com/crd-install=true \
  -f https://github.com/google/knative-gcp/releases/download/v0.15.0/cloud-run-events.yaml

from https://github.com/google/knative-gcp/blob/master/docs/install/install-knative-gcp.md#option-2-install-a-release

Expected behavior
This line should either be removed or cloud-run-events.yaml should be updated to include the proper selector.

To Reproduce
Run the install steps, specifically:

kubectl apply \
  --selector messaging.cloud.google.com/crd-install=true \
  -f https://github.com/google/knative-gcp/releases/download/v0.15.0/cloud-run-events.yaml

Knative-GCP release version
0.19.0 and 0.15.0

Is this selector and its resources important?

[jonbcampos]

when you run the command, you get error: no objects passed to apply