KEP-3751: corrections for milestone 1.31

[AndrewSirenko]

• One-line PR description:

Editing KEP-3751 milestone for 1.31.

• Issue link: Kubernetes VolumeAttributesClass ModifyVolume #3751

• Other comments:

Edits KEP to mention:

• Why Quota support will not be supported at Kubernetes v1.31
• Why Default VolumeAttributesClass will not be supported at Kubernetes v1.31
• Add more details to metrics section
• Fix typos

[k8s-ci-robot]

Hi @AndrewSirenko. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[msau42]

/ok-to-test

[msau42]

/lgtm
/approve

Thank you!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AndrewSirenko, msau42

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