Add steps to fix NooBaa OOM issue

[fketelaars]

Describe the bug
Add troubleshooting steps for NooBaa OOM issue when underpinned by PVC

https://access.redhat.com/solutions/6719951

oc patch -n openshift-storage storagecluster ocs-external-storagecluster \
 --type merge \
 --patch '{"spec": {"multiCloudGateway": {"endpoints": {"minCount": 3,"maxCount": 10}}}}'

oc patch -n openshift-storage \
 storagecluster ocs-external-storagecluster \
 --type merge \
 --patch '{"spec": {"resources": {"noobaa-core": {"limits": {"cpu": "3","memory": "4Gi"},"requests": {"cpu": "3","memory": "4Gi"}},"noobaa-db": {"limits": {"cpu": "3","memory": "4Gi"},"requests": {"cpu": "3","memory": "4Gi"}},"noobaa-endpoint": {"limits": {"cpu": "3","memory": "4Gi"},"requests": {"cpu": "3","memory": "4Gi"}}}}}'

oc patch BackingStore noobaa-default-backing-store -n openshift-storage --type='merge' -p '{
  "spec": {
    "pvPool": {
      "resources": {
        "limits": {
          "cpu": "1000m",
          "memory": "4000Mi"
        },
        "requests": {
          "cpu": "500m",
          "memory": "500Mi"
        }
      }
    }
  }
}'