Issue description

Trying to run the following:

tkn -n openshift-pipelines t describe buildah

returns:

[student@workstation pipelines-creation]$ tkn -n openshift-pipelines t describe buildah
Failed to list objects from openshift-pipelines namespace
Error: failed to get TaskRuns for Task buildah: taskruns.tekton.dev is forbidden: User "developer" cannot list resource "taskruns" in API group "tekton.dev" in the namespace "openshift-pipelines"

It could be good to have a note stating that being logged in as a cluster admin it's needed  to see the tasks in the openshift-pipelines namespace.