fix NOTES.txt

[daroga0002]

This PR is fixing #101 where after installation chart returning wrong feedback from NOTES.txt

After this changes it is now correct:

$ pwd
/GitHub/helm3-charts/charts/nexus-repository-manager
$ helm install nexus3 .
WARNING: "kubernetes-charts.storage.googleapis.com" is deprecated for "stable" and will be deleted Nov. 13, 2020.
WARNING: You should switch to "https://charts.helm.sh/stable" via:
WARNING: helm repo add "stable" "https://charts.helm.sh/stable" --force-update
NAME: nexus3
LAST DEPLOYED: Wed Aug 25 15:06:50 2021
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
1. Get the application URL by running these commands:
  export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=nexus-repository-manager,app.kubernetes.io/instance=nexus3" -o jsonpath="{.items[0].metadata.name}")
  kubectl --namespace default port-forward $POD_NAME 8081:8081
  Your application is available at http://127.0.0.1:8081
$

[daroga0002]

any news?