doc: remove nfs daemonset deletion

As we dont need to delete the nfs daemonset
which was present in 3.6.x release in 3.8.x
release as user will upgrade from 3.6.x to
3.7.x and delete the nfs daemonset.

fixes #3324

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

docs/ceph-csi-upgrade.md

@@ -33,7 +33,6 @@
       - [6. Upgrade NFS Nodeplugin resources](#6-upgrade-nfs-nodeplugin-resources)
         - [6.1 Update the NFS Nodeplugin RBAC](#61-update-the-nfs-nodeplugin-rbac)
         - [6.2 Update the NFS Nodeplugin daemonset](#62-update-the-nfs-nodeplugin-daemonset)
-        - [6.3 Delete the old NFS Nodeplugin daemonset](#63-delete-the-old-nfs-nodeplugin-daemonset)
     - [CSI Sidecar containers consideration](#csi-sidecar-containers-consideration)
 
 ## Pre-upgrade considerations
@@ -392,13 +391,6 @@ daemonset.apps/csi-nfsplugin configured
 service/csi-metrics-nfsplugin configured
 ```
 
-##### 6.3 Delete the old NFS Nodeplugin daemonset
-
-```bash
-$ kubectl delete daemonsets.apps csi-nfs-node
-daemonset.apps "csi-nfs-node" deleted
-```
-
 we have successfully upgraded nfs csi from v3.6 to v3.7
 
 ### CSI Sidecar containers consideration