Merge branch 'flux-tutorial-secret-namespace' into 'master'

Add namespace for secret on flux_tutorial

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135207



Merged-by: Phillip Wells <pwells@gitlab.com>
Approved-by: Viktor Nagy (GitLab) <vnagy@gitlab.com>
Approved-by: Phillip Wells <pwells@gitlab.com>
Co-authored-by: Aldo Maria Vizcaino <aldo.vizcaino87@gmail.com>

doc/user/clusters/agent/gitops/flux_tutorial.md

@@ -121,6 +121,7 @@ To install `agentk`:
    kind: Secret
    metadata:
      name: gitlab-agent-token
+     namespace: gitlab
    type: Opaque
    stringData:
       token: "<your-token-here>"