Docs: Add OpenTelemetry defaults.

[timonegk]

What this PR does / why we need it:

Documentation of opentelemetry addon does not reflect the actual default values.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: timonegk / name: Timon Engelke (82e01d0)

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[Gacko]

/retitle Docs: Add OpenTelemetry defaults.
/triage accepted
/kind documentation
/priority backlog
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gacko, timonegk

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[Gacko]

/cherry-pick release-1.12

[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.12 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.12

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[Gacko]

/cherry-pick release-1.11

[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.11 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.11

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13455

In response to this:

/cherry-pick release-1.12

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13456

In response to this:

/cherry-pick release-1.11

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