Docs: Improve opentelemetry-trust-incoming-span.

[adamvr]

What this PR does / why we need it:

This PR updates the documentation for the nginx.ingress.kubernetes.io/opentelemetry-trust-incoming-span ingress annotation. Specifically:

1. Corrects the annotation name (plural -> singular)
2. Notes that this annotation can't be used without also setting nginx.ingress.kubernetes.io/enable-opentelemetry

We were assuming that since enable-opentelemetry was enabled on the ingress controller we didn't need to set it in the ingress annotations as well, but no you need both.

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

Which issue/s this PR fixes

How Has This Been Tested?

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]

• ✅login: adamvr / (8bc459c)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

Hi @adamvr. Thanks for your PR.

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[Gacko]

/triage accepted
/kind documentation
/priority backlog
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[Gacko]

/cherry-pick release-1.13

[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-1.13 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.13

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[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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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13636

In response to this:

/cherry-pick release-1.13

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13637

In response to this:

/cherry-pick release-1.12

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