[KubeRay] [Doc] Update the link of KubeRay API reference (#41236)

The pull request updates the link of KubeRay API reference.

Related issue number
Crossref:

[Feature] [documentation] Autogenerate CR docs kuberay#438 (comment)
[Doc] Support CRD docs generation kuberay#1625

Signed-off-by: rudeigerc <rudeigerc@gmail.com>

doc/source/cluster/kubernetes/references.md

@@ -5,6 +5,6 @@ To learn about RayCluster configuration, we recommend taking a look at
 the {ref}`configuration guide <kuberay-config>`.
 
 For comprehensive coverage of all supported RayCluster fields,
-refer to the [Golang structs][RayClusterDef] used to generate the RayCluster CRD.
+refer to the [API reference][APIReference].
 
-[RayClusterDef]: https://github.com/ray-project/kuberay/blob/release-0.5/ray-operator/apis/ray/v1alpha1/raycluster_types.go#L12
+[APIReference]: https://ray-project.github.io/kuberay/reference/api/