docs(argocd): ArgoCD no longer uses the pod name as initial password

[peschmae]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Update the documentation about the argocd inital-password and how to retrieve it

Special notes for your reviewer:
I wasnt able to figure out in which version this behaviour was changed, but according to some stackoverflow posts, it was already like this in 2.3.3 (release early 2022). As by default argocd 2.6.3 is deployed, this is be save to change.

Does this PR introduce a user-facing change?:

ArgoCD no longer uses the pod name as initial password

[k8s-ci-robot]

Hi @peschmae. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mzaian]

Thank you @peschmae Good catch!

/lgtm

[floryut]

@peschmae Thank you 👍
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, peschmae

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[floryut]

Force merging this one, no use to re-run a whole CI cycle for a doc change.