quota example command group name wrong for resource deployments and replicasets

$ oc create quota deployment1 --hard=count/deployments.apps=1 
$ oc create quota deployment2 --hard=count/deployments.extensions=1
$ oc create quota replicaset1 --hard=count/replicasets.apps=1
$ oc create quota replicaset2 --hard=count/replicasets.extensions=1
$ oc get quota
NAME          AGE     REQUEST                             LIMIT
deployment1   18m     count/deployments.apps: 0/1
deployment2   19m     count/deployments.extensions: 0/1
example       67m     count/pods: 0/1
replicaset1   8m28s   count/replicasets.apps: 0/1
replicaset2   8m6s    count/replicasets.extensions: 0/1

//create a test deployment
$ oc create -f test-quota.yaml

$ oc get deployment
NAME        READY   UP-TO-DATE   AVAILABLE   AGE
todo-http   1/1     1            1           26s

//the deployments.apps and replicasets.apps successfully increased the count, but deployments.extensions and replicasets.extentions does not increase the count
$ oc get quota
NAME          AGE     REQUEST                             LIMIT
deployment1   19m     count/deployments.apps: 1/1
deployment2   20m     count/deployments.extensions: 0/1
example       68m     count/pods: 1/1
replicaset1   10m     count/replicasets.apps: 1/1
replicaset2   9m46s   count/replicasets.extensions: 0/1


//from oc api-resources, we can see the correct group name:
$ oc api-resources | egrep '(deployments|replicasets)'
deployments                           deploy                                                    apps/v1                                        true         Deployment
replicasets                           rs                                                        apps/v1                                        true         ReplicaSet

you can also check the do280-4.12 student guide, chapter 6