Version-Release number of selected component (if applicable): 3.11.3 STAGE docs

In the STAGE docs, 

Section 6.2.3.1, is missing the command to update cns-deploy and heketi-client. The command is available in the existing LIVE doc. 
This change could have been caused by  https://bugzilla.redhat.com/show_bug.cgi?id=1717751

Section 6.2.3.1, point #4, should have not have the secret written like this - heketi-registry-admin-secret , the secret is created by the user. 
Add command to list the secrets and then edit the existing command accordingly. 
command should look like this - 
oc get secret <heketi-admin-secret-name> -o jsonpath='{.data.key}'|base64 -d;echo

Section 6.2.3.1, point #8, the name of the secret should not be given like such. 
The secret name heketi-registry-config-secret has to be edited into the existing command by the user.
command should look like this - 
# oc create secret generic <heketi-config-secret> --from-file=heketi.json

Section 6.2.3.1, point #9, 
For cns-deploy based deployments, it won't be heketi-registry. 
Change needs to be made in the following command -  #oc delete deploymentconfig,service,route heketi-registry

Section 6.2.3.1, point #12, 
oc get pods output for all the OCS pods running should not be pod names with registry. Please make change in the example. 

In Section 6.2.3.2, point #2,
Give output of the command #oc get ds , as the ds is used in the next step. 

In Section 6.2.3.2, point #3, 
the example for deleting glusterfs ds with --cascade=false should have the correct ds name. 
command should be like this -
oc delete ds glusterfs --cascade=false

In Section 6.2.3.2, point #4,
Edit the oc get pods output. It should not have registry.