Add permanent link to keystore passwords

[SgtCoDFish]

also adds a little more context

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[jetstack-bot]

@erikgb: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to [this](https://github.com/cert-manager/website/pull/1356#pullrequestreview-1769836199): >/lgtm > >Which I am still not eligible to do. 😉 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/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[inteon]

/lgtm /approve

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: erikgb, hawksight, inteon

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