Updated manifest for k8s persistent volume installation

Merged escaleira requested to merge fix/kubernetes_manual_installation_volume_issue into master

When trying to follow the documentation for the manual installation of a Kubernetes cluster, I came across a small issue: When trying to apply the referred manifest for the persistent volume installation, I was given the error:

error: unable to read URL "https://openebs.github.io/charts/openebs-operator-1.6.0.yaml", server reported 404 Not Found, status code=404

In fact, when trying to access this URL in my browser, I encountered the same error (404, File not found).

Therefore, I decided to analyze the OpenEBS's GitHub, and there the developers advise to set up OpenEBS using Kubectl the following way:

$ kubectl apply -f https://openebs.github.io/charts/openebs-operator.yaml

In conclusion, this was the modification I have done in this pull request, as well as some modifications to the commands' outputs. To test if everything was running properly, I then added the newly created cluster to OSM (version 11.0.1), which gave no errors.

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