Update release-notes handbook path

[pacoxu]

/sig release

Which issue(s) this PR fixes:

Fixes #8509

In release team, docs and release note team were merged to new docs team.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pacoxu

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• contributors/guide/OWNERS [pacoxu]

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[pacoxu]

cc @nmn3m

[cblecker]

/label merge-method/squash
/lgtm

[k8s-ci-robot]

@cblecker: The label(s) /label merge-method/squash cannot be applied. These labels are supported: api-review, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash, team/katacoda, refactor, ci-short, ci-extended, ci-full. Is this label configured under labels -> additional_labels or labels -> restricted_labels in plugin.yaml?

In response to this:

/label merge-method/squash
/lgtm

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[cblecker]

/label tide/merge-method-squash