Update breaking changes details 1.16

[wallrj]

Preview: https://deploy-preview-1568--cert-manager.netlify.app/docs/releases/release-notes/release-notes-1.16/#breaking-changes

• Applied @maelvls 's suggestions (from https://github.com/cert-manager/website/pull/1520#discussion_r1778271475)
• Prioritized the Helm schema information (as suggested by @SgtCoDFish in https://github.com/cert-manager/website/pull/1565#discussion_r1777437666)
• Added some further reading to the Helm schema section.

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