Fix incorrect shoot maintain annotation

[Wieneo]

How to categorize this PR?

/kind bug

What this PR does / why we need it:
The currently documented annotation for triggering shoot maintenance is wrong. This PR fixes that.

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[coderabbitai]

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• hugo/content/docs/guides/administer-shoots/maintain-shoot.md is excluded by !hugo/content/**

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[BoHristova]

Thanks for fixing the annotation, @Wieneo! :)

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BoHristova

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[gardener-prow]

LGTM label has been added.

Details

Git tree hash: dbdab61f7ae2ea93776cfb3dadde104090acb272