CRD generation - fix bad anchors

[jhkrug]

Following the Docusaurus upgrade to 3.1.1 improved link/anchor checking shows that the CRD generator is creating a few invalid internal document anchors. Can be seen when running yarn build.

Investigate and fix.

Build website logs: https://github.com/kubewarden/docs/actions/runs/7842546401/job/21401094164
Check for Broken Anchor warning messages.