fix(docs): Update the repository path url to a valid value

[revitalbarletz]

The path values should be either helm-guestbook or kustomize-guestbook instead of just guestbook. Fixed the tutorial accordignly as well as updated the image to include the right values.

Issue: #20822.

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[nitishfy]

PTAL

[revitalbarletz]

It does not work with guestbook, I am not able to create the application.

[blakepettersson]

@revitalbarletz this manifest works for me using guestbook

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  namespace: argocd
spec:
  destination:
    namespace: guestbook
    server: 'https://kubernetes.default.svc'
  sources:
  - path: guestbook
    repoURL: 'https://github.com/argoproj/argocd-example-apps'
  project: default
  syncPolicy:
    automated:
      prune: true
    syncOptions:
      - CreateNamespace=true
      - PrunePropagationPolicy=foreground
      - PruneLast=true

[nitishfy]

For me it works with guestbook too.

project: default
source:
  repoURL: https://github.com/argoproj/argocd-example-apps
  path: guestbook
  targetRevision: HEAD
destination:
  server: https://kubernetes.default.svc
  namespace: default

If it doesn't show you the guestbook path on the UI, try inserting the path manually instead.

[revitalbarletz]

Thank you @nitishfy for checking this out. I Will debug my failure and close this PR.