docs: add note about startupapicheck to 1.15 upgrade notes

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✅ Deploy Preview for cert-manager-website ready!

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[inteon]

/approve /lgtm

[cert-manager-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/cert-manager/website/blob/release-next/OWNERS)~~ [inteon] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[cert-manager-prow[bot]]

@inteon: No presubmit jobs available for cert-manager/website@release-next

In response to [this](https://github.com/cert-manager/website/pull/1495#issuecomment-2150324896): >/retest netlify/cert-manager-website/deploy-preview Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[inteon]

/override netlify/cert-manager-website/deploy-preview

[cert-manager-prow[bot]]

@inteon: Overrode contexts on behalf of inteon: netlify/cert-manager-website/deploy-preview

In response to [this](https://github.com/cert-manager/website/pull/1495#issuecomment-2150342311): >/override netlify/cert-manager-website/deploy-preview Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[ThatsMrTalbot]

/retest netlify/cert-manager-website/deploy-preview

[cert-manager-prow[bot]]

@ThatsMrTalbot: No presubmit jobs available for cert-manager/website@release-next

In response to [this](https://github.com/cert-manager/website/pull/1495#issuecomment-2150342503): >/retest netlify/cert-manager-website/deploy-preview Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.