clarify 1.17 upgrade requirements

[bhcleek]

Clarify the 1.17 upgrade requirements for storage so that it doesn't
ready as if an entire cluster has to be drained before any node can be
upgraded.

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[saschagrunert]

/lgtm
Thank you 🙏

[saschagrunert]

/ok-to-test

[bhcleek]

A simplification was requested in kubernetes/kubernetes#87090. Do you want the same simplification here?

[saschagrunert]

For sake of consistency, please yes. :)

[bhcleek]

PTAL

[saschagrunert]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bhcleek, saschagrunert

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