[occm] Update docs for default-tls-container-ref

[mandre]

What this PR does / why we need it: Since eeba485, occm now accepts barbican secrets (https://<keymanager_host>/v1/secrets/) in addition to container ref (https://<keymanager_host>/v1/containers/) for the default-tls-container-ref option.

This commit updates the doc to reflect the change.

Which issue this PR fixes(if applicable):
fixes #

Special notes for reviewers:

Release note:

NONE

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[dulek]

/lgtm

[dulek]

/ok-to-test

[jichenjc]

/approve

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