Spotinst: update help wanted in release doc

[yehielnetapp]

This change is clarify that Spotinst is to support this tool

[k8s-ci-robot]

Hi @yehielnetapp. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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[hakman]

/ok-to-test

[hakman]

/retest