Fix typo

playbooks/common/openshift-cluster/upgrades/v3_5/validator.yml

@@ -59,7 +59,7 @@
         migrating to StatefulSets, run this command as a user with
         cluster-admin privileges:
 
-        $ oc get petsets --all-namespaces -o yaml | oc delete -f - --cascale=false
+        $ oc get petsets --all-namespaces -o yaml | oc delete -f - --cascade=false
     when:
     # Search did not fail, valid resource type found
     - l_do_petsets_exist.results.returncode == 0