k8s docs: bump pdf stable version to release-1.6

[Oreoxmt]

Update the stable PDF version of TiDB Operator from release-1.5 to release-1.6

[Oreoxmt]

/hold

[ti-chi-bot]

Hi @Oreoxmt. Thanks for your PR.

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[ti-chi-bot]

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[Oreoxmt]

/unhold

[purelind]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-27 08:31:40.253193776 +0000 UTC m=+2678854.010329349: ☑️ agreed by purelind.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: purelind, Yuiham

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[purelind]

/ok-to-test