📖 book: document required permissions for GetObjectFromContractVersionedRef

[chrischdi]

What this PR does / why we need it:

Did hit this case at kubernetes-sigs/cluster-api-provider-aws#5720

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

/area book

[k8s-ci-robot]

@chrischdi: The label(s) area/book cannot be applied, because the repository doesn't have them.

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In response to this:

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

/area book

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[chrischdi]

/area documentation

[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

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Git tree hash: dc518a620dfcf3360c01cef930b89c8b40c29e97

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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Needs approval from an approver in each of these files:

• OWNERS [sbueringer]

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[chrischdi]

/cherry-pick release-1.11

[k8s-infra-cherrypick-robot]

@chrischdi: new pull request created: #12999

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In response to this:

/cherry-pick release-1.11

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