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)
• Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

Pure documentation change

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: sjlawton / (ef6af53)

The committers listed above are authorized under a signed CLA.

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[Gacko]

Suggested change

[Gacko]

Can you maybe add this as a separate section after client-body-buffer-size.

[Gacko]

/triage accepted
/kind documentation
/priority backlog

[Gacko]

Suggested change

	|[nginx.ingress.kubernetes.io/client-body-timeout](#custom-timeouts)[number]:
	|[nginx.ingress.kubernetes.io/client-body-timeout](#client-body-timeout)|number|