[MKP/doc] Guideline needed for post-deployment setting about service account

[numerology]

Since we decided to remove service account credential from our MKP deploy page, the user will need to figure out how to correctly apply SA credential after deploying KFP themselves. A clear doc/guideline is needed for this.

Currently, we are planning two preload samples require additional permission to run.

• XGboost sample, which requires dataproc permission
• TFX-OSS sample, (see [Sample] Add new TFX::OSS sample #2319), which requires GCS (storage) permission.

Current documentation regarding how to apply SA credential after deployment

[numerology]

cc @jessiezcc @gaoning777 @Bobgy

[numerology]

/close
Fixed by #2394
and other doc improvements as well.

[k8s-ci-robot]

@numerology: Closing this issue.

In response to this:

/close
Fixed by #2394
and other doc improvements as well.

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