docs: [release-1.4] update OpenTelemetry set up documentation

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1954

/assign kim-tsao

[openshift-ci]

Hi @openshift-cherrypick-robot. Thanks for your PR.

I'm waiting for a janus-idp 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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[kim-tsao]

/ok-to-test

[kim-tsao]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kim-tsao

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