fix: link typo in crd docs

Author: tkxkd0159

content/en/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions.md

@@ -750,7 +750,7 @@ validations are not supported by ratcheting under the implementation in Kubernet
   - `not`
   -  any validations in a descendent of one of these fields
 - `x-kubernetes-validations`
-  For Kubernetes 1.28, CRD validation rules](#validation-rules) are ignored by
+  For Kubernetes 1.28, CRD [validation rules](#validation-rules) are ignored by
   ratcheting. Starting with Alpha 2 in Kubernetes 1.29, `x-kubernetes-validations`
   are ratcheted only if they do not refer to `oldSelf`.