Update Github Workflow CRDs documentation

[math280h]

As mentioned in this comment under issue https://github.com/yannh/kubeconform/issues/211#issuecomment-1967351777

-schema-location does not seem to work in Github Workflows when passing the value like 'value' which is how it's mentioned in the docs

This PR updates the documentation under Github Workflow to show how to pass -schema-location