"passphrase:" is missing from oci.yaml example

[tonychoe]

In the OCI tutorial, the example of oci.yaml is incomplete.

It misses the "passphrase:". Without it users will face a decryption error.

Checklist

• Update changelog in CHANGELOG.md, use section "Unreleased".

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[tonychoe]

Signed the CLA.

[tonychoe]

/kind documentation

[seanmalloy]

/lgtm
/assign @Raffo

[Raffo]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Raffo, tonychoe

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