Docs: Document `client-body-timeout` annotation.

[sjlawton]

Client body timeout is currently documented only as configmap but it is supported as nginx ingress annotation

What this PR does / why we need it:

Solves annotation that is missing from documentation

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)
• [x] Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

Pure documentation change

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] 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[bot]]

• :white_check_mark:login: sjlawton / (ef6af53b1b777f75582be4d8e063419e21b4998a)

The committers listed above are authorized under a signed CLA.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Gacko]

/triage accepted /kind documentation /priority backlog

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This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.

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/remove-lifecycle frozen

[strongjz]

@sjlawton Are you able to make the updates requested?