Can't override links to already built-in types

I am trying to override a link to the Quanity type from `k8s.io/apimachinery/pkg/api/resource` ([Link](https://github.com/keptn/lifecycle-toolkit/blob/b1dd064934b9bf5654cac0b948dcc0ff6ad2b39b/.github/scripts/generate-crd-docs/crd-docs-generator-config.yaml#L15-L17)).

But the generator is not respecting my config at all and uses the built-in k8s generated API links.

Seems to me that this is not an issue specific to my type but rather a general issue.

I provided a [draft PR](https://github.com/elastic/crd-ref-docs/pull/89) to showcase the issue.